Hey rosscoa, you came to the right place.
Okay here is the deal, what you are shooting for as far as temperature goes is "room temperature".
You can do this by simple filling up an empty jug or bucket and let it sit out WITH NO LID. No lid? Here is why. If your like me municipal water had chlorine and fluoride etc etc etc in it. These are things your plants could do with out. By letting it sit open to air the chlorine degases and leaves you with superior water. Not only does your water release the chlorine it will set it self to room temperature.
Hope this helps!
-DIYguy