Fresh sparkling water

When you go to the toilet at night time, Who often rushes in and watches the flush but sometimes she stays longer so I wondered what she was doing next picture explains everything.

Even the top is off so they can drink out of the tank if thirsty and they have run out of water but this one is not fussy, she does drink out of the toilet, I don't know how she does it without falling in, she will also sit in the bath if the tap is not turned off completely and drink from the drips.