I have considered doing some drops solo. Maybe I'll get around to testing this out someday. For now, here goes.
The Preparation: Attach a cut/shaped piece of cargo/fish net underneath the fuselage. Fish net should have a hole in the middle, with line going through the edge of the netting at the hole, so that it will close when pulled tight. Ice cream bars should be packed in box within box within box, with generous amounts of bubble wraps. Place the box onto the netting when it's on the ground, pull the line tight which would both keep the box in the net and raise the entire net and box against the bottom of the fuselage. With the line tight, lead it through the door jam of your door and tie it off somewhere secure and easy to reach, with a quick release knot and/or have a knife handy.
The Drop: Target drop zone should be somewhere that provides some cushion, like spongy, low bush growth of some type. When at your drop zone, at your prescribed drop speed (not stall) pull the quick release knot out and let it go out your door. The line will continue to run out, opening the net at the bottom, dropping your box. No need for a passenger. No need for major in-cabin movement and potentially distracting actions that would otherwise keep the plane in safe, level flight. Make sure the quick release line is fairly long, so that after releasing your box, you simply pull in the line again, which would also pull the net back up against your under-fuselage, away from your gear.
If or when I try this sometime and if it works, then I'll let you all know.
