How high can they be due to I have bad knees and have a hard time getting out of low sitting position. What can you bring in for water?

There is a way to the lawn that isn't the huge stairs (I even had trouble with them). You still have to go up some stairs, but not as many right behind the pavilion area on both sides. I believe you can bring in bottled water but that's it. There is bottled water available for a price, but we drank beer. If you're going to be on the lawn the chairs are like what you see people sitting on at the beach. They are low. If you're concerned, I would suggest either a wheelchair or paying for pavillion seats. You'd be more comfortable. Depending on the concert, people stand for most of it anyway whether in lawn or in pavillion. Hope this helps. Have fun!

Long trek and tons of stairs to the lawn. I cant do them. Suggest getting seats

There is a water bottle Filling Station there and you can fill it as many times as you like

If you sit in lawn bring a chair. You can only have 1 bottle of water not sure on size. The regular seats are hard but like a normal chair.