Make yourself one of these:
What is that thing? I can't figure it out...it looks the like hose doesn't have water come out anywhere on the broom or the black thing.
First year I built a rink at my new place as son just turned 3 and did the same thing...out the window from the laundry sink and a little warm water does wonders. The few days of warm weather + rain in Jan & Feb ended up making it perfect ice.
Your rink looks pretty large - what are the dimensions? Mine is good for a little kid but only 28' X 14'
I punched holes throughout the black hose so that water pours (mostly) on the mat, and the mat spreads it fairly evenly. I drag it behind me so the broom picks up any snow or twigs and needles that have fallen from the trees, before the mat resurfaces the ice.
My rink is ~35'x35' at the back and left boards, but there is a tree at the front/right corner that cuts off about 5 square feet.