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Yeah, repeat you experiment without ever leaving the scale. Weigh yourself, have someone hand you the water, drink it, then hand it back, weigh yourself again, repeat as desired.
Aside: At room temperature, the density of water is essentially one g/ml or one kg/l. Now, I doubt that you drank a whole litre of water, but it is quite conceivable that a large glass would hold half a litre. So you probably drank half a kilo of water, just over 1 pound.
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