What? You aren't handy enough to build one?
More than handy. You have to understand, my wife won't water anything (plus we are metered). She'd rather call me at work to tell me the plants are withering and I'll have to water them, when I get home from work. She WON'T do it, "it's too hot outside", she says.
We live in a dry shade area and the outside temps can hit 105+ during the day(summer), and sometimes we get an inversion layer so that it'll be 90 at midnight.