firstly I will look up “ergonomic shapes” to get an idea of what would work well with the body.
http://tinylittlelife.org/?p=317 in this link there is a home project tht someone made an ergoniomic keyboard that bends upwards. I don’t know how well it works but it looks interesteing.
http://www.innerdesign.com/blog/products/Luno-container-by-Martin-Jakobsen this is a bottle with a wide opening and minimalistic design.
https://www.typing.com/blog/read/gettin-crazy-with-the-keyboards weird and creative looking keyboards
http://www.cyclestyle.com.au/brands/memobottle-australia/ this was made by swinbune student who designed a flat water bottle.
-also spanish architect antoni gaudi.