I afraid of needles and of opiate addiction so I never used injectable drugs but if I had to inject myself with an homemade solution, I would follow that manual

I afraid of needles and of opiate addiction so I never used injectable drugs but if I had to inject myself with an homemade solution, I would follow that manual¹ , use a syringe that include a filter² and usebacteriostatic water like gavinray said. That should cover all the probable risks, with the exception of those caused by the substance itself. 1) https://harmreduction.org/issues/safer-drug-use/injection-safety-manual/safer-injection-basics/ https://harmreduction.org/issues/safer-drug-use/injection-sa... 2) https://www.exchangesupplies.org/shopdisp_filter_syringe.php https://www.exchangesupplies.org/shopdisp_filter_syringe.php