Between 2 tanks and a shared sump, I have ~200 gallons of water. To get adequate CO2, I have 5 or 6 half-gallon bottles in rotation at any given time. We harvest a half-gallon of wine every 5 days, or enough for me and the mrs to have a glass each with dinner every night--couldn't have planned it better if I tried! If you don't drink and find yourself with an abundance of wine, then I'm sure that when random friends hear of your predicament they will start appearing at your place to help you out!
Although cooking wine is nice too. Soon enough, I will get around to posting all the details in my setup, as promised in my signature, with recipes for red, white, etc. I'll let you know when that happens Cobra.