Refilling works 100%. Drinking directly from pump does not.

If you are full, both water and food...You can run for 1h 30m atleast without going starving or thirsty. Just figured that out.

Yes. It seems unresponsive most of the time. i have to press 1-9 atleast twice to equip wanted item.I play on servers with 40 latency(ping) so that should not be an issue.

I tried it only once indoors.Worked fine atleast for me.