I Am Just Curious About Drinking Water, I’m Not Big

I am just curious about drinking water, I’m not big on regular water, but like the Sparkling ice flavored water. It says no sugar....so is it ok to drink in place of regular water. Or brewed tea with truvia sweetener.....I’m over 62 and really noticing weight gain in the last year which I have never had an issue. I know I need to exercise more, but time is limited. I am self employed and work a lot of hours.