I make my own coleslaw, (sweetheart cabbage, carrot, red onion, light or normal mayonaise (plus/or celeriac, red cabage) I have this at any meal,breakfast, lunch as a side for dinner or as a snack, full of fibre and slows sugar/ carb absorbtion of anything to eat afterwards.
Also like a hot breakfast, bubble and squeak , using any previously cooked veg but mainly , any sort of cabbage, any sort of onion, with celeriac (I use as a potato substitute), butternut squash, sweet potato, parsnip, carrot. I also eat a full english say bacon, eggs, no added sugar baked beans from M&S (50p) occasionally a with a slice of pumpernickel from Tesco ( seems to lasts forever). All packed with fibre.
Water can also come in the form of tea, coffee, sparkling, milk etc so mix it up if you find litres of water a bit daunting.