Re food -- I get my potbellied pig food from PA Heartland in Pa., comes UPS. See http://www.paheartland.com The food is specially formulated for pbp, high in protein, low in fat. If you don't want to order from them, go to either Southern States or Snells in Prince Frederick and get the Mazuri potbellied pig food. Its pretty much the same. Don't get the regular swine/pig food, because that's formulated to put the weight on.
I feed my guys 1/2 cup in the morning, 1/2 cup in the evening, and give them a bedtime snack of oatmeal with either bran or a few cut up banana slices in it. I wet the food with warm water, not soupy, but enough to wet it all. They love it that way, and I think its easier to digest. Its easy to overfeed, because the 1/2 cup doesn't look like much, but -- believe me -- its enough. If you add the water and let it sit, you'll see the food swell up. Does the same thing in piggy's stomach. And it fills them up.
You are right -- they love grapes! Mine also like those carrots that come in a bag, the little ones. Just the right size for a treat!
PA Heartland also sells harnesses, leads, and a whole host of pbp products, including apple and peanut butter treats.
Another good source for piggy stuff is http://www.pigstuff.com/herd/
They are in New Jersey and sell all things pig! They run a potbellied pig sanctuary in New Jersey and the proceeds support the sanctuary. When you go to that site, in the upper left hand corner is a box. Click on it and select Message Board. Its a place where you can get good advice and exchange information with other piggy owners.
Oil in the food -- I add about a teaspoon of canola oil in each feeding (not at bedtime, though). Its good for their skin, and lubricates their system. Olive oil works as well, though its a little more expensive.
Re spaying and neutering -- I took Precious (my first pig) to Pennsylvania to get spayed because I could NOT find a vet in this are who had experience in spaying a potbellied pig. I spent two days on the phone trying to find someone locally (as well as in the Washington metro area) that had experience at this. One knucklehead said he'd never done it before, but was sure it wouldn't be a problem. Just bring her on in..... I don't think so!! Its NOT like spaying a dog or cat, its more complicated like a historectomy (sp?). Since then I found a wonderful vet on the eastern shore -- Dr. Mike Forney, Chestertown Animal Hospital. He's well know nationally for his expertise with pbp. He saved the life of a friend's pig a couple of years ago, when all other vets had given up on her. It takes about 90 minutes from Calvert County to get there, but I found its well worth the trip to go to someone who knows what he's doing. If somebody going to cut into my babies, they darned well better have some expertise! (and about 100 good references! LOL) I took Freddie and Flossie there for spay/neuter. Franklin had already been neutered by the breeder when I got him. I'd recommend him highly.
BTW, there are two annual events for pbp's and owners. The first is the annual Potbellied Pig Congress held in Pennsylvania. There are workshops on health, feeding, training, etc. Presentations by vets too. It was held two weeks ago, and will be held again next April. Franklin went with me (he's two years old), and stayed in the hotel room with me. Lots of folks brought their pigs, and its a real hoot. We stayed at the Comfort Inn at Pottstown, Pa. Conference was Friday night, Saturday and Sunday morning. Let me know if either of you want to get on the mailing list for info on next year's conference.
The second event is Pigstock (ok, so we don't take ourselves too seriously!). Its held in the fall, October, I think. Last year it was at Pigtailz Junction in N.J. (the sanctuary referenced above). I think they have about 100 pbp's. Really something to see. This year, its closer....will be held in Culpeper, Virginia (about 3 hours away)at Mini-Pigs Sanctuary. See: http://www.minipigs.org/ I've visited there, and its quite a place. These events are open to anyone who has an interest in pbp's.
Well, I got pretty windy here, and this was longer than I planned. Hope it answers some of the questions.
Belly rubs and snooters to your babies!