For real. Everytime I get in the shower I end up having to point the showerhead away and cower from the cold water and I could have just turned it on first?
You're not supposed to just stand there and waste that warming-up water, you're supposed to collect it in a watering can and put it on your plants! It's got stuff from having sat in the water heater so it's not the best for drinking but plants don't mind.
I don't think that's possible in my 1970s building. My water heater is in the kitchen and the tub/shower is way across the apartment so I get 2 gallons. I have a big balcony with lots of happy plants.