Here is my Water Quiz for 2021. It is surprisingly hard to develop because the numbers are all over the map. I have 15 multiple guess questions. Answer them all before starting to Google the answers. For which questions do you have a high confidence in your original answer? I’m trying to use current stats; different sources give different estimates. Sometimes old news is no longer accurate (maybe it never was accurate). I generally used US and US units of measure unless specifically indicated otherwise. Answers, scoring and sources will be forthcoming.Celebrate the day. Go, drink a glass of H2O.