For peptide and GLP-1 users mixing at home

Mix it right the first time.

Bacteriostatic water in 10 mL and 30 mL glass vials, priced by the millilitre — with a calculator that works out how much you need before you buy it.

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Without doing the math
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Without per-vial price games

From $0.50 per mL · 4 packs from $19.00

Choose your pack

Not sure how much you need? Open the calculator

Lot lookup

Lot lookup opens with our first shipped order.

Price per millilitre

2 × 10 mL$0.95
5 × 10 mL$0.78
2 × 30 mL$0.65
5 × 30 mL$0.50

Pack prices, totals and savings are in the packs section.

Two sizes

One product, two fill volumes. The rest is arithmetic.

A 30 mL vial costs less per millilitre than the same volume split across 10 mL vials — every time, at every pack size. More vials means more separate stoppers to open and more flexibility if you only need a little; more millilitres in one vial means a lower price per millilitre. That is the whole trade, and the numbers below are the whole argument.

Every per-millilitre figure on this page is computed from the pack price at render time. Nothing is typed in by hand, so nothing can drift.

See every pack and its per-mL price

10 mL vials

$0.78per mL

best available in this size, at 5 vials

More vials, more separate stoppers.

30 mL vials

$0.50per mL

best available in this size, at 5 vials

Fewer vials, more water in each.

36% less per millilitre in the 30 mL vial than the best 10 mL price on this page. Same product, different fill volume.

Packs and prices

Every pack, priced by the millilitre.

The category prices per vial because per vial hides the arithmetic. Here the price per millilitre is the big number and the pack price is the small one, so you can compare these against anyone — including us.

2 × 10 mL$0.95per mL$19.00 for the pack · 20 mL totalSmallest pack we sell.The pack the others are measured against5 × 10 mL$0.78per mL$39.00 for the pack · 50 mL totalFive separate vials — open one at a time.18% less per mL than the smallest pack2 × 30 mL$0.65per mL$39.00 for the pack · 60 mL totalSame price as five 10 mL vials, 10 mL more water.32% less per mL than the smallest pack5 × 30 mLLowest per mL$0.50per mL$75.00 for the pack · 150 mL totalLowest price per millilitre on this page.47% less per mL than the smallest pack

Bar length is the price per millilitre. Shorter is cheaper.

The store is not open yet — this page went up first.

Price per millilitre on every pack, computed from the pack price — check it yourself.
We will never tell you what dose to take. The calculator converts volume; your prescriber decides the rest.
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Proof

The certificate is the product.

The honest answer to “is this real water or tap water in a vial” is not a sentence on a website. It is a laboratory report you can open yourself, without asking us for it — and check against the lab that issued it.

Every vial carries a lot number, printed on its label.
That lot number is a web address. One lot, one page, no login, shareable.thebacwatercompany.com/lot/<your lot>
The report lists each test against its pass threshold: benzyl alcohol content by gas chromatography (USP <621>) — 0.90% against a 0.9% ±10% specification; purity 99.9% against ≥99.5%; two impurity screens; refractive index; and pH 5.5 (USP <791>) against 4.5–7.0. Issued by Kovera Labs, verifiable on their site by sample ID.

Today there is one certificate, for the product as tested — its lot field reads “n/a”, so it is not yet a per-lot page. Per-lot pages open with the first production lot. We would rather show you one real report than a certificate we invented.

Open the Kovera Labs report (PDF)KVR-2026-13A97E

Kovera Labs, analysed 2 June 2026. Verify the sample ID at koveralabs.com/verify.

Straight answers

What you are actually worried about.

Is this real water, or tap water in a vial?

You should not take our word for it, and we are not going to ask you to. The only thing that settles this is a document with your lot number on it that you can open yourself — which is the entire reason the lot page exists and the entire reason we will not publish one before it is real.

It has been tested by an independent laboratory, Kovera Labs, and the report is on this page. It measured the preservative at 0.90% benzyl alcohol by gas chromatography, purity at 99.9%, and pH at 5.5, each against a stated pass threshold. It is distributed by Pure Chain Logistics Group LLC. What the report does not do is name a fill site or certify a lot number, and until it does, neither will we.

Will it actually arrive?

A fair question in this category, and a badge is not an answer. What belongs here is the carrier, the cutoff, the dispatch record and what happens when something goes wrong — stated plainly enough that you could hold us to it.

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Am I overpaying?

Somewhere, probably — the category prices per vial precisely because per vial hides the arithmetic. Every pack here shows what a millilitre costs, worked out from the pack price in front of you. Compare that number against anyone, including us, and buy wherever it is lowest.

I have never mixed anything before.

Then start with the calculator, not the cart. It converts a vial of powder and a volume of water into a concentration, shows its own arithmetic, and tells you how many millilitres you need to order. It will not tell you what dose to take, what schedule to follow, or how to titrate — that is between you and your prescriber, and a website that offers you otherwise is one to close.

Specification

What is in the box.

Fill volumes: 10 mL and 30 mL
Container: Glass vial
Sold as: Multi-packs of 2 and 5
What bacteriostatic water is: A category definition, not a claim about this fill: bacteriostatic water is water with benzyl alcohol added as a bacteriostatic preservative, commonly at 0.9%. The preservative is the reason a vial can be entered more than once instead of being discarded after one draw.
This fill — grade, source and tested composition: Water with 0.9% benzyl alcohol as preservative, in a glass vial. Independently measured by Kovera Labs at 0.90% benzyl alcohol (gas chromatography, USP <621>) and pH 5.5 (USP <791>).
Filled and packaged at: CLIENT-COPY-NEEDED
Storage and shelf life: CLIENT-COPY-NEEDED
Intended use: Sold for laboratory and research use. Nothing on this site is medical advice and nothing here is a dosing instruction.

Questions

Asked before buying.

How much bacteriostatic water do I need?

That depends on your vial and the concentration you have been told to make, which is exactly what the calculator is for. Put in the amount of powder and the concentration, and it returns the millilitres to draw — and therefore how much water to order. It shows its own arithmetic so you can check it.

What is the difference between bacteriostatic water and sterile water?

Sterile water contains no preservative and is intended to be entered once. Bacteriostatic water contains benzyl alcohol as a bacteriostatic preservative, which is what allows a vial to be entered more than once. Which one is appropriate for you is a question for whoever prescribed or supplied your medication, not for a shop.

How do I know what is actually in the vial?

By opening the page for your lot number and reading the certificate yourself. That system is being built and is not live yet — and until a real lot has been filled and tested there is nothing honest to put on it, so there is nothing on it. Anyone showing you a certificate today is showing you one they made.

Will you tell me what dose to take?

No. Not in the calculator, not in an email, not ever. We convert powder and water into a concentration — that is arithmetic. What you take, how often, and how you change it is between you and your prescriber.

Do I need a prescription to buy this?

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How fast does it ship, and what if something goes wrong?

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Still not sure how much you need? Open the calculator or go back to the packs.