With pellets I would just put a few out with a regular top up as necessary, they don't tend to eat more than they need. A little fresh grass once the weather settles down. With veggies if I divide by 4 what I'm giving 4 piggies it comes down to about 1/2 a medium carrot per day, 1/8 medium pepper, 1/8 of a small apple, 1 leaf of Romaine lettuce, 1 or 2 florets of Brocolli or a little Kale, 2.5 cm of cucumber plus if you eat Melon they love the outer yellow skin with a little bit of flesh on it (about the same amount as cucumber). Mine also get the ends of tomatoes used for sandwiches. It's all down to what they like. Mine also get Readi Grass & a little porridge oats plus of course, lots of hay.