We are fans of Basil Lemonade. I make a Simple Syrup then add a cup or so of fresh crushed basil while the syrup is cooling. Then I use the Basil Simple Syrup to make lemonade. The longer the basil sits and the more you use, the stronger the basil flavor. I haven't tried it, but it occurs to me that you could add sparkling water to the lemonade to give it effervescence.

Another great suggestion from Syronai

Something I do occasionally: Blend 1/2 fresh cucumber in a blender with about 1 tsp lime juice and 3-4 cubes ice. Mix equal parts with ginger ale and float frozen blueberries in it. It's delicious, looks really festive, and stays cold a long time because of the blueberries! It's good with rum as well, but completely holds its own without the alcohol.

http://www.drysoda.com/
Dry Sodas are my favorite food friendly non alc drink. Flavors like cucumber, rhubarb, and lavender...just to name a few. Not too sweet. Really yummy!!!

Thanks for disclosing, i'm whipping up the ginger lime brew tonight. Thanks for this.

There are some more ideas here: http://www.seriouseats.com/2010/12/party-planning-non-alcoholic-drinks-mocktails.html (full disclosure - my husband wrote this piece :) )

We love Knudson's Sparkling Cranberry Juice -- it has been a constant at our Thanksgivings.

I'm intrigued, many thanks... Especially since your note arrives while I'm about to enter Whole Foods.

I had a non-alcoholic fermented soda from Whole Foods that was a nice change of pace (Light Red): http://www.cheerscascal.com/