Step 1: Gather the parts.
-3 inches of 3/8 inch hose
-Hot glue or other sealant
-A water bottle
-Clear film canister (usually available at any place that develops photos, ask for one)
Tools that will come in handy:
-Drill with 3/8 inch and 1/2 inch drill bits
-Belt sander/metal file/sandpaper