Yes swapping out soda for water and juice is a great option.
A low-cal snack is edamame (soybeans) and they're actually really good. Worth trying. Don't cut out everything because then you'll have intense cravings. Cut back on things.. like for me I have treats once or twice a week.. including chips. I eat lots of fruit and that paired with working out keeps my weight down.
Good luck, you can do it!!