Is it safe to drink my contaminated water?

A zombie fell into my town's well and couldn't get out. It died in there. I feel sorry for the thing but there really wasn't much we could do.

Anyways, apparently our town water's contaminated now, meaning that, in the game's words, "drinking it [today] would be a great way to get infected". Does this mean that if I drink the water I'll be guaranteed to get an infection, or is it based on chance?

Also, we've got some water rations from today in the bank. If I take one of them out tomorrow, will it still be infected?

The Gazette is a lie(Guess it's more of a joke, than a lie). The water is safe to drink!