I was going to suggest a similar solution as
Thunderbird already done did! An inverted 2-liter bottle of water, hole in the cap, a limited-expanse drip system.....the crystals, they come under various Brand Names, would also help.....I live in the Desert, SE Arizona, and it gets 115 degres F. here but, if one provides enough shade during the afternoon, a hardy plant should survive under the conditions mentioned, i.e. water-retention gel/crystals & a slow-drip water feed......