As mentioned, the soil moistue might have been convenient but contra productive. To save you work you could choose other options......1. Prepare your soil with rotten wood that works like a sponge and saves water and offers nutrition while being decultivated. You can also put something on top of the soil like leaves. Anything that lets the earth still breathe but protects it from direct sun. You could also Use a 5L bottle for example, put a small hole in it and let it drip the water slowly to allow a steady supply. If you combine all these, you might save yourself watering daily during the hot times and it might work out watering them once/twce a week