For the bacteriostatic water I use, these are the guidelines I stick to. First off, I pay no attention to the expiration date printed on the container. Second, after breaking the seal on the stopper, the water gets used up inside three months. I mark the container with the date it was first opened. The water stays at room temperature, following what the maker suggests. This approach works because the solution fights bacteria more effectively while those organisms try to multiply in warmer conditions. Third, once I mix some of that water into a peptide container, a fresh three-month countdown begins for the mixture. The peptide container then goes into the fridge to keep the contents stable, and I note the mixing date on it too. This setup means the water might have been opened up to six months earlier by the time it's all used. Still, since my living space probably carries fewer harmful microbes compared to a medical facility, I'm generally healthy, and the shots go under the skin rather than into a vein, even though the product allows for the vein route which carries more risk, these changes seem acceptable to me. I stick with the guidelines not out of fear that any change would definitely cause an infection, but because skipping them would raise the chance of problems enough to make following them the safer choice.