This is very cheap to make and tastes delicious. When our neighbor, Cindy, was asked to live on their food storage for a month she made this and the kids loved it. They didn't know there was rhubarb in it.
4 cups chopped rhubarb
1 1/2 cups sugar
1/4 cup water
1 pkg. Kool Aid brand powdered soft drink mix
Bring rhubarb, sugar and water to a boil and simmer until rhubarb is soft. Cool slightly and blend well in a blender (or use an immersion blender). Add the Kool Aid and blend again. Pour into a cookie sheet that has been sprayed very well with a non-stick vegetable spray (or pour onto dehydrator fruit leather sheets and dry in dehydrator). Put cookie sheet into the oven at the very lowest temperature; crack the oven door open so the moisture can more readily escape. Leave in the oven until leather is dry. Peel leather off the cookie sheet, roll up, cut and store in airtight container.
Our favorite flavors are cherry and grape. The grape leather dries a curious green-purple color. Do not attempt this recipe if you are using a warped cookie sheet. You want to get the leather to a uniform thickness so it will dry evenly.
If you have some fresh fruit you can add it and if you have enough you can leave the Kool Aid out. Strawberries are a nice addition. You cannot tell there is rhubarb in this fruit leather. It is very tasty and cheap to make. Do NOT use lemonade Kool Aid. It makes fruit leather that is even too tart for me.