DIY - How To Make Fabric Softener Sheets..
Found this article. Haven't used it but it sounds like it makes sense:
ALTERNATIVE WAY FOR FABRIC SOFTENER SHEETS..
Pour one bottle of liquid fabric softener into a large container with lid.
Fill the empty softener container with water and add it to the container.
Repeat to give you a 2:1 mixture of water to fabric softener.
Drop sponges into the mixture.
Grab a sponge, wring out the excess liquid, and add it to the dryer with your wet clothes.
Seal your container between uses.
if You do try please stop by and let us know if it works. I wish I had the supplies I would test out first..