A couple of things that need pointing out, different water companies charge different amounts under the water sure scheme. A lot of people are paying far too much because these companies are greedy!
5 years ago I got a water bill for £600, I called them up and asked if they could install a meter (I new they couldn’t because I’m in a large block of council flats, they sent me a small form to fill in, I returned it, and the bill miraculously halved, I just applied for the water sure scheme, on line, and miraculously the bill halved again. 5 years ago £600 now less than £150.
Oh another thing PIP/DLA are not classed as income on the application form for water sure and are dealt with separately.
Hope this helps.