How do you make noncaloric sweetened fruit water?

You could make a tea with zest (orange, lemon or other citrus peel) and cool it down to drink as a fruit flavored beverage but it wouldn't be sweet. To do more than that you would need access to the labs where they make artificial flavours and sweeteners. I would suggest drinking real fruit juice. Just drink less and drink more water. Fresh fruit is very good for you, just don't over do it. So, try squeezing homemade orange juice, having one glass and drinking water for your next three beverages.