Tourist and stae, yes contaminated water on threads and such is certainly something to watch put for. I'd run water from tap into my large mug carefully, uv it not splashing around, then pouring it into my bike bottles.
as for eating, I ate nearly always at road side and family eateries where locals eat. I was taught by my very experienced, smart traveling partner to ideally go to the places that seemed popular. Better chances of food not hanging around due to turnover, plus if locals were there, chances were that it was good. One also gets a feel for dodgy looking joints, but sometimes your choices are limited. Takes a little while too for your gut to get accustomed, and that's where immodium is damn important to have with you.
also stae, re water availability in covid times, yes it was strange at times biking this summer. We luckily had things under control fairly well so it wasn't that bad.