I found a supplementary powerr supply that fits in a 5-inch drive bay, and is designed to power TECs.
It's kinda pricey ($120), but it's all setup for what you might need, and won't steal room that could otherwise be used for your radiator and other water cooling stuff.
I'm new at this stuff myself, so I'm not really sure if a reservoir is necessary, or how much good it does to have all that extra water in the system.
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