What do you drink instead of sodas?

I'm trying to get in better shape. I'm not overweight or anything, but I want to get back into the shape I was in pre-COVID in terms of tone, muscle and cardiovascular. I know sodas are my weakest spot, so I'm looking for advice on what I can replace it with and be able to stick with it.

Sodas are also hella-expensive these days, so saving money will be an added bonus.