Surefire way to check if a spring is safe to drink from

https://ani.social/post/28817332

‘Drinking from a fetid pond’: superbug-creating genes found in UK’s largest lake

Exclusive: Lough Neagh, which supplies drinking water for 40% of NI, contains genes resistant to last-resort antibiotics

The Guardian
I know this is a joke, but please boil any water you find in the wild.
Dysentery is very serious, you can die.