Ben Dover's Paper Boat

You must be next to a moving body of water to cast this spell.

You write on a sheet of paper a list of basic supplies that you need. Fold the piece of paper into a toy boat and float it downstream. At some point within a day, some or all of the supplies you requested will arrive from upstream on a small boat*. The boat and the supplies can be used for 3 days from the time at which the spell was initially cast, after which they disappear. 

The boat and supplies are considered magical objects, and look somewhat transparent and illusory. Otherwise they can be used like the real objects normally would.

*Not responsible for missing or damaged items.