Ooof...
Big question!!
Total depends on you I suppose!! Mine has been:
Loads of fruit and veg (extra veg if you plan on making zero point soup)
skimmed milk
some brown bread (WW own is one of the lowest)
Low fat ready meals (a god-send)
Fat free/Low fat yogurts (can also be frozen to make 'ice cream')
low fat cottage cheese
Reduced fat cheese
LF soft cheese (tesco's extra light have flavours, whereas Philly extra light is just plain)
Lean cooked meat (Ham etc)
Lean raw meat (always have some in freezer - just in case)
Low fat sausages (Tesco Light choices - 2pp per sausage)
Quorn products (lower than most meat)
Low point treats (WW bars, curly wurlies etc)
Some sort of savoury snack (WW crisps, quavers, walkers baked)
Some tinned soups (WW ones are really low)
VLF spread
Sweetener (if you use sugar)
A low pp cereal (weetabix, shreddies, shredded wheat)
SF squash (loving Mozzers Sherbet Lemon flavour at the mo)
SF/Diet Pop (Tesco do a lovely diet cola with almond - tastes like amaretto and coke!!)
Frozen Veggies
Frozen ready meals (for emergencies)
Brown pasta and rice
Lots of tinned toms etc - can bulk out a meal without adding points
Herbs and spices, picallili marmite, mustard, lea and perrins, tobasco, stock cubes - diet food often needs an extra kick!!
That's all I can think of now, hope it helps a bit. It's just about finding what you like to eat, and what you want to 'spend' your points on!!
Good luck