Bacteriostatic water is widely available and you hydrate it in the container it comes in. Its pretty easy. I promise you you probably know someone on a glp-1 that is already doing this.
I found it in a mainstream site here. 30ml for $300, with free shipping for next Wednesday. It has classified as a "nutricional supplement" for bodybuilders. I didn't purchase it, but I guess now I'm in yet another list.
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You probably have to disolve it in very clean water in a very clean container. Do you have to match the salinity and pH with the proprties of the blood? How much time must you stir it to ensure it's completely disolved? Do you have to add something to increase/reduce viscosity? Some alcohol in case there are a few bacterias or improve solubility? How long does the small homemade batch last in the fridge?
IIUC there is another version in pills, they may have a longer shelf life, or not. But ask a medical doctor before taking a ramdom medicine.