Goal and options: How to sew the inter tube onto your socks?
output answer: Put a little vegetable oil on the inter tube before putting it on your sewing machine. Put in the string and guide your socks over the inter tube. Guide the string along the edge of your socks.

Goal and options: Warm bed and save energy.
output answer: Slip hot water bottles between bed sheets.

Goal and options: To use something other than cat litter for a litter box.
output answer:
Purchase pine pellets as they deodorize and remove odors as well as clump nicely.