Apartment living, no money, warm water

I started taking cold showers in the winter and experienced some great benefits. I’ve noticed fewer of those benefits as the weather has warmed up and when I measured the temperature of my cold water, it was 72°F. I only have a small counter top ice maker which isn’t enough to cool off much water and my shower isn’t big enough to put a bucket on the floor without knocking it over (2.5 ft x 2.5 ft). Does anyone have tips maybe involving cooling the pipe going from the wall to the shower head? Have ya’ll found something that offers comparable benefits in the summer?