Guatemala water safety

Ahoy hoy! We are heading to Guatemala in one week on the tourist trail - Lake Atitlan, Antigua, and a nice resort near Flores. We travel to lots of places where we take normal water precautions, like brushing our teeth with bottled water and requesting no ice in drinks. Then maybe sometimes you forget and rinse your mouth in the shower, or your drink did have ice or something, and either nothing happens, or you take some Imodium and you’re basically fine in a couple hours.

About 10 years ago, we went to Nicaragua, landed, ate one meal at a highly rated restaurant, and I was STRUCK DOWN by the hand of god. For 3 days, no solid or liquid would stay in my body for more than 15 minutes, and we had started to discuss evacuation options with the hotel. That was with travel antibiotics. Anyway, at the end of the day, I didn’t die or get evacuated, so it was a successful vacation. But not looking to repeat this.

My question is this. It sounds like Guatemala may be more like Nicaragua. Is it mostly just around Lake Atitlan that you need to be hyper vigilant, and then just normal effort precautions everywhere else? Or do we need to be like HIGH ALERT EXTREME VIGILANCE everywhere we are going?

Please also feel free to leave your worst travel illness story in the comments. It will give me something to read in between projectile vomiting next week!