How to find meds

hi, I just joined. I have a lot of canned goods but I want to know where or how I can get medicine like antibotics? I don’t want to have to get hurt (on accident) and wait to get prescribed something and save it. Ive been trying to save some past prescribed stuff but I feel there’s a more smart way. I’m just trying small things to prep. my partner has other things taken care of.