Watering can is not disabled, and actually works. When you compare it to other packs though it does not offer quite the same speed boost. Crashlanding crops are slow to grow (due to hunger overhaul) , the watering can helps, but crop growth is still slower than you'd experience in other packs.
Well if its not disabled its definately bugged, i crafted the watering can with bone meal but i cannot get it to work, there is no watering animation when i try to use it.
I believe older versions require you to fill them up with water via right clicking it on a water source.
I tried to do that, the watering can is no longer shown as empty, i tried combining it with a bucker, right clicking on a water tank, right clicking on a water source block, nothing, and when trying to use the watering can, which the item is named "watering can", not "watering can(empty), it does nothing EDIT I will see if my particle effects might be turned off, i dont remember them being turned off.
Particles might be set to minimal by default, I had to move mine up, and I wouldn't have set them that low intentionally.