Tea good replacement for soda?

I need to kick this Huge soda problem i drink 2 double gulps...will tea sweetened with spenda help me kick this my family are tea drinkers.but we drink water from fossit witch is nasty so when i brew tea will it take some of the harmful nasty stuff out of my water? kuzz i dont wanna go to 7/11 everytime just get buy 25c gallon of water