Do you pee in the shower? If not, you should start. 
It saves on toilet paper. Even if you use a green toilet paper, using less is still better than using more.
It saves water. According to Go With the Flow, if 15,000 people peed during their daily shower for one year, it could save enough water to fill an Olympic-sized swimming pool 26 times. If everyone in New York City peed in the shower every day for one year, we would save enough water to fill over 14,000 Olympic sized swimming pools.
Saving water also means saving money.
And it leaves you cleaner than even the best toilet paper or wipe ever could.
And if you’re wondering, yes, it is perfectly clean and safe. Pee seems pretty gross, but it’s actually sterile. And if you pee in the shower, then your pee and dirty shower water will go to the same place that your dirty toilet water would go.
If you’re not ready to start peeing in the shower yet or if you want to take the next step, try putting a bucket in the shower with you. The bucket will collect water that was about to go down the drain anyway. The next time you use the toilet, instead of flushing the usual way, pour the bucket of water into the toilet. This will cause the toilet to flush. The only difference is your toilet won’t waste as much clean water on that flush.
Another option is to not flush for pee. Many households use the motto “If it’s yellow, let it mellow. If it’s brown, flush it down.”