Assume the water bottle is the most sturdily built standard water bottle one could acquire in an american supermarket.
This is the first question I've asked, so I'm sorry if I'm not in the right place or asking it the right way. If I may I'd like to throw in these follow up questions:
Is there a good way to approximate how good an object would be at serving as a long term floatation device, like a pontoon or bouy?
Is there a way to calculate what the optimum size or shape of a 'water bottle like structure/material' (pocket of air encased in plastic) would be for displacing weight lifted out of the water by the buoyancy?