Hi Steven, Before my well pump went and I changed over to town water I would use the hose to soak them. If you think the water's too cold, keep some 5 gallon pails full and use the water that's been sitting in them. Since switching to the town water, I now use water collected in a rain barrel. I keep 4 or 5 gallon milk containers full in the house so I always have room temperature water.
Get the rain barrel set up, it's the best thing you can do for your plants!
Bill