you can water them once a day Todd depending on heat will determine how much... a good option is to install a soaker hose into the garden bed and then just grab your hose, connect to it, and turn it on for a bit....

this way you arent watering the foliage, and leaving beads which can cause severe burning depending on how much sun you get...water in the morning, so the plants can suck it up and use it during the day...