For country people with water tanks.
In Australia, the average toilet flush typically uses around 5.5 liters of water. However, the most water-efficient toilets, often with dual-flush systems, can use even less, with a full flush at 4.5 liters and a half-flush at 3 liters, averaging around 3.3 liters per flush. Older toilets might use up to 12 liters per flush.
How much water will weeing into plastic bottles save?
3 liters a half flush
12 pees a day
3×12=36 liters a day
36×7=252 liters a week
252×4=1,008 liters a month
1008×12=12,096 Liters a year.