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When I was sleeping outside, every morning I'd get crippling diarrhea out of nowhere, it would last hours and sometimes it'd come back after meals. Later I realized it was because I used to drink cold water after just waking up, apparently it hurts the stomach.
Warming up the water before drinking should prevent this problem and if the climate you are in is cold, like below 10C during day, you need to cover your stomach with more layers after a meal otherwise digestion fails and you get liquid shit.
