How do you keep your water cool?

[jsanders]

I know this is stupid to most of you, but it is giving me fits. I have tried ice bags, frozen gallon jugs, swamp coolers... How do y'all keep your water cool. I would give my right whatever to have a cool stream running close to the house, or hell! even a swimming pool, but I don't. I use a large garbage can and recirc the water through it, then when it gets warm I let it pump out and refill. I have run it straight from the hose which works great but is expensive.

How critical is the water temp? How much should I let the temp vary, I know it effects the still output a lot.

Any ideas to get me started would be great.

Thanks