Why are you scared..? When I had a problem with my eye, I had to take liquid antibiotics, and they smelled like fruit. ^^ I took it with Sprite, and it was gone in no time. I'm sorry you have an infection. Get well soon!
(PS. I saw this really sickly looking halfmoon (it was labeled, but I can tell what tail type bettas are better, now!) it looks so upset and it had fin rot, I was angry at the people. one person left a note and I yelled out that the lil white halfmoon was sick, but the people ignored me, but I think I'm gonna go back for it when I'm prepared!)
cause my dad is a jerkface. he didn't want me to have my fish, but my mom forced me to take care of it. also, I might get another pet like a bunny or a bird or... whatever, my parents think I'm responisble and I'm also about to do a thing with my mom so that whenever I get 10 pennies, I get a prize and I might get a 10 gallon with heater and possibly filter EARLY.