Going along simular lines as the soda, I use beer. For my recipe, it's equal parts AP flour and beer, usually something alittle sweeter like a red. My favorite is to do summer squash and pea pods, serving them with a light, honey vinagrette for dipping. I've always had good reviews, just make sure the beer is flat, and the veggies are dryed with a paper towel so the batter sticks.