We have an Excaliber dehydrater. It came with a sheet that we can lay in the tray for the liquid. The fruit roll ups are good.
As far as the pineapple, no real ratio. We just pour some lemon juice in a bowl and put in a tablespoon or 3 in and stir till its well mixed. Then just drop in some pineapple so they are covered. Give them a few minutes in the mix stirring some. Let it stop dripping when you pull it out, load it on the trays, and load bowl back up and do it again.The lemon is more of a perservative, honey a little for taste. No receipe, just try it a few times and get the taste you want.
Pineapple is my favorite fruit and I could eat this stuff all day long. Good luck