Almost impossible to quantify. Depends on your metabolism and activity. I assume you intend to consume nothing but water for 3 weeks. I would do a little more research into the potential risks to your health before embarking on this mission. You risk malnourishment, changes in mental state, hypoglycaemias, and kidney damage.
That is 18,041.403 pounds
Approximately 1,419.34 pounds @8.34 pounds per US gallon.
200 cubic feet of water weighs about 12,462.5 pounds or 6.23 tons.
Approximately 1,620.2 pounds.
If one liter of water weighs one kilogram then 27 cubic feet will have a weight of 1,685.55 pounds.
you ar ea couple of pounds hevy but you can lose the weight fast.
Approximately 1,775.9 pounds.
The weight of 2.25 cubic feet of water is approx 4495 pounds-force (lbf).
Approximately 102 pounds for 1.63 cubic feet of water (12.2 US gallons).
Nothing. A weight is a force whereas a pound is a measure of mass. For example, a mass of 27 pounds would weight nothing in outer space (at the Lagrange points to be more precise), but would have a weight of millions of pound-weight near a black hole.
One cubic foot of water weighs about 62.4 pounds.
62.427 pounds is the weight 1 cu.ft. of very cold fresh water .