As long as your adding good water, go for it. Be careful adding tap water as it will have chlorine/chloramine. Before I invested in an IC that's what I would do. Throw a couple gallons in the fridge and you can drop the temp of your wort pretty quick.
Homer: “I’m feelin’ low, Apu. You got any of that beer that has candy floating in it, you know, Skittlebrau?”
Apu: “Such a product does not exist, sir! You must have dreamed it.”
Homer: “Oh. Well then just gimme a six-pack and a couple of bags of Skittles.”