Eli5 How did travelers/crusaders in medieval times get a clean and consistent source of water

Question

Eli5 How did travelers/crusaders in medieval times get a clean and consistent source of water

In: 4489

Answer 1

Short answer they didn‘t… that‘s why WW1 was the first war in human history where more soldiers died by the hand of the enemy than illnesses starvation and thirst

Edit: since there is a lot of disagreement:

https://en.m.wikipedia.org/wiki/World_War_I_casualties

Here it says 7-8 million combat related deaths
2-3 million deaths by accidents and disease