Drinking tap water instead of buying bottled water is better for the environment. You aren't throwing away bottles. You aren't draining the water from someone else's community. And your own tap water doesn't require fuel to get to you. Tap water is earth-friendly!
Soda presents the same issue. It's basically flavored tap water. It uses a lot of energy to transport. It takes water from someone else's community. It creates a lot of waste from bottles. So why not make your own?
It's pretty easy to carbonate your own tap water using a seltzer maker. SodaStream has great kits that are easy—and fun—to use. You can buy their flavors or make your own. Or just drink the carbonated water straight. It's refreshing!