I have a very large mug that I drink water from at home.  It’s something I had from when I was a kid and a big football fan.  It’s hard to see from that photo but it’s substantially larger than three coffee cups.  How much larger?  My lovely wife wanted to measure it, but no way — it’s the size of one metric dan marino.

So I measure my water intake at home by the quantity of Dan Marinos I’ve drank that day.  Since I usually drink about 1 L (pronounced “ell”) at work, I usually try to get at least one and even better two Dans so to not be dehydrated.