Hi emmie
If you are on pension credit you can also get help with your water bill - can be 50% reduction! Below is what it says on the website of my area, Thames Water, regarding Water Help, but other companies have similar schemes, though they are not well-publicised. It's worth making the effort to find out.
"If you live in a low-income household, we may be able to discount your bill through WaterHelp.
WaterHelp was previously known as WaterSure Plus until March 2020. It still has the same criteria and benefits – only the name has changed. If you’re already on the scheme, you don't need to do anything. Your bills and letters will change to show the new name over the course of the year.
If you qualify, we currently offer a 50% discount on your whole bill, although this amount may change in the future.
We consider households earning below £16,105, or below £19,565 in London boroughs, to be on a low income. In order to qualify, we’ll need to check your details and verify your income. You can find out more information on how we look at your income on the back of the application form."