I'm sorry for your loss.
However, piggies cannot have any type of replacement formula. Like Angelgal said, Critical Care is the best thing if they aren't already eating solids.
I have a piggie named Jasper too! Have you read Twilight? I'll bet you have...Emmett and Jasper are *awesome* characters. Even if you haven't...cool names. My Jasper is getting (you can read my Kitchen story for complete info on the little guy) three friends, Emmett, Edward and Carlisle.