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        Q: How big should my water bottle be?
A: Normally 8 ounces , and I would say about eight inches tall for the tall sport kind . 

Q: Do water plants with cold, hot, or room temperature water?
A: Plants would survive better in room temperature water . You can pour slight warm water to plants , that would assist strengthen its growth . ( Not hot water ) . You can mix cow urine with water . Even human urine mixture with water also good for plants , since it contains Urea and other excreted minerals , that will assist in plants get enough nutrients . ( but excess urine in water would cause bad odour in the vicinity , so you should take caring ) 

Q: How can i build a water bottle rocket?
A: ( First you need some way to put a lot of compressed air into the bottle . If you are doing this ) well where 's the rest of the answering subsequently