I actually got my PVC pipe from a hardware store because they would cut it into lengths that were shorter than 10'. I just want to make cheese, not lay down household plumbing! Food grade means that it is designed to handle potable water. You don't want the stuff that's rated for sewage.
I figure that I have enough cast iron cookware to do the job for weights, but I had to add a 30# free weight on the top. I need to re-think that. I lifted the weight off of the top of the press this morning to remove my farmhouse cheddar, and I felt something snap in my back. If the press were lower, the weight would be fine, but I have to keep it up on a counter top or the dog drinks all of the whey out of the pan. *sigh* Making cheese in a house with dogs and cats and maintaining the sanitary requirements isn't easy, considering it has to sit out in open air. Some day... when the planets align... I'll have a room that's all mine where I can make cheese and make soap (not at the same time) and no one has access but me. Now if I can get one of the kids to move out....