People will use lava buckets for camping and water buckets are op when it comes to reducing fall damage. That's a no from me :)Maybe also being able to buy lava buckets or water buckets would also be awesome, but then people are able to hide under the map etc..
I also don't think implementing this kit would be a good idea. The tnt sounds fun but the eggs will ruin it. Shields will no longer work and it will be impossible for players to get to other islands (since the players can farm the kit).