FWIW...on occasion I get an ingrown toenail and I dont realize its all that bad till it eventually it gets infected and painful. I know this is somewhat off topic but what I do now is break open a Doxycycline capsule and put the powder directly on the infected area. I’ve done this 3 or 4 times and every time the pain is noticably better in a few hours and totally healed in 2-3 days. Ive learned now to take better care of my feet to avoid this...but just sayin...this works!
Another cheap and effective anti-infective that has been around a long time is Zephiran Cloride (benzalconium cloride)
“Preoperative preparation of skin: ZEPHIRAN solutions 1:750 is recommended as an antiseptic for use on unbroken skin in the preoperative preparation of the surgical field. Detergents and soaps should be thoroughly rinsed from the skin before applying ZEPHIRAN solutions.”
I was introduced to this product over 50 years ago when my newborn son was suffering from oral thrush. He hated the antibiotic the doctor prescribed for him. I asked if there was something else effective I could use, so he said buy a bottle of Zephiran Cloride, one to 750 dilution, and swab his mouth with that a few times a day. In a few days, baby was better and found this treatment much less unpleasant. since the 1;750 dilution was safe for an infant, I imagine you could also use it for a nasal swab to reduce bacteria. This one 8 oz. $8 bottle lasted throughout my boy’s childhoods, good for skinned knees, minor cuts and the like. I just Googled it and it still can bought for a reasonable price.
The package insert information contained many uses for this amazing compound. For example, in an even weaker dilution it could be used for washing out an infected bladder, using a catheter.
Another surprising treatment I discovered was the use of green mold on oranges. Turns out this green mold on a citrus (acid) fruit is penecillin. I have rubbed it on minor cuts and scrapes that seemed a little infected, and it cleared them up just fine. This is a valuable piece of survivalists information, especially long term if you live where oranges and lemons can be grown or found.