Answer:
Hard to catch, easy to hold. Can't be seen, unless it's cold.
In we go, out we go. All around and in a row. Always, always steady flow. When we'll stop, you'll never known. In we go, out we go.
A precious stone, as clear as diamond. Seek it out while the sun's near the horizon. Though you can walk on water with its power, try to keep it, and it'll vanish in an hour.
The more you take, the more you leave behind.
My first half is normally made of stone, my second is crazy, and I taste sweet when complete.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.