I was wondering how much water I should give big boy tomato plants daily?
The answer to that question depends on the size of the plant, whether it's in full sun and in the wind, if it's potted or in the ground, etc. Lots of variables. Here's an article that helps you figure out the answer for your own situation: https://www.leafari.com/watering-plants-how-much-how-often.html
I have tiny holes in the bottom of many of my tomato's and I don't know what they are or what to do. I am growing a big boy hybrid this year. I usually plant roma and have never seen this before. HELP! Please!
This looks like Blossom end rot from your image.
Here is a link with more information.