ZIllions. From the top of my head, and in addition to the above:

- compressed air tank (used 2 for DIY snuba device, can be used for improvising the energy source for the pneumatic instrument as well, as it holds up to 150 PSI);

- cut out 4 spoons;

- plants auto watering device;

- plants manual watering can;

- automatic animal feeder (grain/water);

- attach to a tree for a camp hand/face washing station;

- air/water pump (suck or blow);

- water distiller (put green leaves inside);

- plastic is hot-shrinking (apply heat over the plastic ties to tighten them);

- plastic of the bottle and of the cap can be melted to make seals, used as a glue, formed into hard plastic things, used to repair holes;

- the top screw with the cap can be used to seal plastic bags, make tarp attachment points, gather ends of fabric;

- cut out a grain/flour scoop;

- make long air/water pipes (cut ends, stack, shrink/melt joints);

- firestarter (water lens);

- camera "tripod" (1/4x20 screw in the cap, sand/water in the bottle);

- shoes (cut an entrance or flatten and add straps);

- sleeping bag warmer (feel with hot water, wrap in clothes, hug it);

- neck pillow;

- flashlight mount/stand/headband/diffuser;

- fishing bobber, fishing net floats;

- knee/elbow abrasion protection;

- safety glasses;

- smoke mask;