This is a review of a product (the bucket sling) which may make it far easier to move heavy items like buckets full of prepper food / liquids:
http://fivegallonideas.com/review-bucket-sling/DO NOTE: I think these can be easily made by hand, at home, either by hand sewing with a canvas needle or a heavy duty sewing machine... Look closely at the material used, it is strapping which can be purchased in bulk rolls from many hardware and auto supply stores.