Double Jump potion

Jump boost isnt used much, and there is no point to getting it. A rabbits foot drops 1/10 rabbits killed, and it does, well, nothing. Jump boost 1 give a jump of 1.5 blocks and jump boost 2 gives a jump of 2 blocks. 

This could replace jump boost... but I would rather have it as something you can craft.

Double jump 1 would give you just a second jump, while double jump 2 gives you a third one, at the cost of time. This would pair well with speed and jump boost, and add something to mess around with, opening up new things for map creators.