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What you need is a soda bottle, a measuring cup or scale, a funnel, some water and some urine.
Fill a 2 liter soda bottle with water right up to the top of the label. This will give you about 1.7 litters.
Pee is full of urine. Pee in a measuring cup until you have 300 ml. If you can not pee this much at one time hide the cup ...
If you really want to make stuff grow don't stop here by just using urine. To make stuff really grow add your urine to 2 part regular soil ...
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