Here's what I wrote in answer to an earlier post about Xtol: ** What I do is make the 5 liters, divide it into 1 liter, 500ml, and 125ml bottles. All brown glass, quite full and tightly capped. When the smallest bottles are used up I transfer the contents from the larger ones to the smaller ones. So I have 125ml premeasured bottles to work from that are always as fresh as possible. If I think its getting old I just dump it and make a new batch. Why 125ml? Because I can simply mix it with 125ml of water for 250ml of 1:1 or 250ml water for 1:2 or 375ml water for 1:3. Want 500ml of 1:1? Use 2 125ml bottles. Simple, fast and always as fresh as it can be. ** I've kept it for up to 5 months this way. In completely full bottles only. Make your stock solution with distilled water only. Follow the directions on the bag. Let it sit for a while after you've mixed it - until its all dissolved. Then pour it into the small bottles.(posted 8199 days ago)Also I noticed that someone wrote above in this string that it was only going to be made in 5 gallon packs. Its actually 5 liters. Thats a lot less!
So buy small glass bottles that hold the amount you desire for one-shot use. Cole-Parmer is one place. Photographers Formulary is another. They'll probably be in American units i.e. 4 ounces but don't worry, filled to the top they hold 123-125ml or 8 oz. bottles @235-250ml Keep the box they ship in and you have a nice orderly way to store them.