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Travel sized bottle of baby powder is awesome. Powdering your feet, crotch and crack absorbs sweat, reduces chaffing/blisters, neutralizes odors and it reduces poo-stickage which in turn reduces the amount of TP you need.
Cornstarch, talc and/or baking soda while also work but a good baby powder mix already has that in it.
Other than that, it's mostly been covered. Pack towel, degradable soap, etc.