Economical water temperature control

I'd like to find a way to control the hot/cold balance of my wash water to maintain about a 68 to 72 degree range (say, +/- 2 degrees) without spending hundreds. In the winter, my water temp keeps drifting ever downward. I can start out at 70 and find it at 50 ten minutes later. I was thinking about a Moen temperature controlled shower valve, for example.

And in the summer, the water comes out of the ground at 80 already, if not 84. How to maintain a supply of 68 or 70 degree running water in summer? I think about mounting a 5 gallon tank above the counter and filling it with water and some ice cubes. Or, put the tank in a small refrigerator set to 68 degrees and mount the whole thing close to the ceiling for gravity-feed.

Any experience, ideas, opinions, or comments?

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