How often should you water your upside down tomato plant?

This can be a difficult question to answer because I don't know which zone you are in. I am experimenting with upside down tomatoes this year (2007) and I am in zone 7. We have had little rain this year ( i don't think rain matters though because there is such a small area in the top of the bucket, just like most container gardening you need to water every day) My tomatoes are in 5 gallon paint buckets. I have wave petunias growing in the top. I use a tsp of miracle grow to a gallon of water for each bucket (1 plant tomato plant per bucket) I water each bucket everyday with a 1 gallon solution. Some days I'm lazy and don't add the fertilizer, but the plants never let me get lazy because if they need water they will let me know. Usually by 11:00 am or so when the sun begins to get hot. I have had nice juicy tomatoes since around the 4th of July. I'm growing Better Boys, Lemon Boys and romas. I love growing my tomatoes this way. If you would like more info and pictures you may email me at Lovellc21.net and I will send more info to you.