FWIW:

Here is a bit more information about the use of sugar as a readily availble antibiotic. This was mentioned earlier in the thread but its something I find interesting because sugar is readily available and easy to maintain in my emergency stores.

Although the article heavily recommends PI in addition to the sugar, there is a particularly relevant passage explaining the mechanism through which sugar works, and how it must be used carefully to avoid the reverse effect:

"Since the effect of granulated sugar upon bacteria is based upon osmotic shock and withdrawal of water that is necessary for bacterial growth and reproduction, this diluted syrup has little antibacterial capacity and may aid rather than inhibit bacterial growth.

So to continually inhibit bacterial growth, the wound is cleaned with water and repacked at least one to four times daily (or as soon as the granular sugar becomes diluted) with more solute (sugar) to "reconcentrate" the aqueous solution in the environment of the bacteria. "