I would suggest that carrying a bit of detergent with you (in a small, very tight bottle) and a similar bottle of bleach is the safest answer. Boil some water, add a bit of detergent (you don't need a lot -- 1/4 teaspoon is probably more than enough), wash the tools thoroughly, then immerse in a mild bleach solution for a few minutes, rinse again with boiled water and dry thoroughly, then oil.
The only other way might be to heat the tools in an open flame, but that might not be the best treatment for some knives, etc, and probably wouldn't get into the grooves of a folding knife.
"He died of diarrhea" is not something I would want to see in anyone's obituary. <img src="/images/graemlins/blush.gif" alt="" />
Sue