These are growing in 40 gallon tubs with holes drilled about 2 inches up on the sides. They have a water reservoir at the bottom so they don't go into wilt from the heat. I don't even have to water them daily.I have found that my peppers, ESPECIALLY if you have them in pots. when it is THAT hot out, you need to water them twice a day.
Once early in the morning then once at about noon / 1 pm when the sun is blazing
or one about 11 am, and 1 towards end of day, night coming. This way they have some wet still to suck up during the hottest /bakingest part of the day.
observe your plants, about the time they start getting all wilty and poopy looking, about an hour or so before then, is when you want to get the water on them.
Remember plants in pots dry out twice as fast, because the heat is hitting their entire root ball too, it's in the pot, and can get HOT, VERY HOT, as it does not have the entire earth to take the heat away from it.
aaron
I used to grow my peppers in the ground and those did wilt every single day, even with daily watering and lots of good shade. In the ground they needed daily x2 watering or more for most of the summer. I gave up on that here except drought tolerant decorative plants. Everything we eat loves water! So everything edible goes into planters of some sort with constant water to sip at.