How to drink an extra liter of water a day!

nis75p06

So I got a sodastream, the Genesis, a couple of weeks ago as a gift and have tried most of the flavors that came with it. Not real happy with any of the flavors - ended up pouring a lot down the drain because I HATE the taste of artificial sweeteners and even their non-diet flavors have sucralose in them. I would much rather have unsweetened drinks than sweetened with artificial sweeteners. So yesterday I just now realized realized that if I just carbonate water and add a packet or two of True-Lemon I get perfect lemon flavored bubbly water and I drink like an extra liter of water a day... Yes, I'm slow that way sometimes - took me two weeks to realize I didn't need the syrups that came with it...

Thinking of trying some coffeehouse syrups like they use at Starbucks. I know they have sugar, but if I only use an ounce per liter, it's only like 70 cal per liter.

Anyone have a favorite Italian soda syrup brand - preferably one with an online store?