It seems it really doesn’t matter. I would have been just as well off asking the tomato. I found several sites, dedicated to gardening, with seemingly authorative advice on the issue. However, they all differed. The answers ranged all the way from everyday to once a week; and I don’t simply mean depending on different weather conditions. I mean, listing the same types of conditions (mid-Summer, not much rain, deep South), the answers varied this much; and these are ‘organized and professional’ sites on gardening. I’m not trying to ‘dis’ these people that provide this information, because I know they are just trying to be of friendly assistance. I mean, it obviously is not as important as I thought it was.
Exasperated, I asked a small kid, while I was hiding a smile, how often to water my tomato plants. He said I should water them when it gets hot outside. Sounds like a good answer to me. If a tomato could talk, I bet he would say water me every day.