This video explains how to mix 10ml bacteriostatic water with 5000iu HCG for Dr. Simeons Protocol. You can also use a larger bottle of bacteriostatic water such as 20ml or 30ml and just take out the extra water to get down to 10. You can also use a larger bottle for more than one person. For instance buy the 30ml bact water if there are 3 of you doing diet. Then each person has their own sterile vial that they put their bacteriostatic water/HCG into.