In the last three Ahadith, Imaam Bukhari has emphasized on using less water for baths. He collected these Ahadith under one chapter. Today’s Hadith is a reinforcement.
Narrated Ibn ‘Abbas:
The Prophet (SAW) and Maimuna (RA) used to take a bath from a single pot.
A pot is a pot. It’s not a drum of water. It cannot be a tank of water. A pot can contain 10-11 liters of water at max. And that amount of water is (should be) enough for two people to take baths from. Try it!