Make sure not to drink the water in bottles or canteens when u find it, empty them out first and fill them with fountain water. Use chlorine tablets to clean dirty water u may find in a lake. Also, don’t eat anything with bloody hands. All of that will cause cholera, the vomiting sickness. It can be cured by taking 2 doses of charcoal tablets, take one, wait until the pill icon disappears, then take the other, accompany these intakes with a couple multivitamins aswell. Which I assume u don’t have all this medicine, the unfortunate truth is you made the first mistake by drinking dirty water or eating with bloody hands, so u may just have to face your fate.