This is a possible opportunity for me to plug my invention. For some reason I am having difficulty in getting people to take it seriously. I suggest its potential, not least for boat camping, is immense.
It's - dehydrated water. It weighs virtually nothing, takes up no space (apart from the compact packaging), and is extremely easy to reconstitute - you simply add water and it is ready for immediate use.
I just need about £200k for some straightforward commercial development. Contact me if you're interested.
(Patent and application to appear on the The Dragons' Den pending.)