Equipping a waterflask in an equip slot, most likely in a hand would be rather cool.
When stam goes low, it auto drinks for you, if you have it equipped.
Now i know that most of you will be like "BUT TEH MAKROWERS WILL HAFF MOAR AVANTIDGE!!!"
And i reply with: "Breathing gives macroers an advantage, so stfu"
It'd be a nice feature to add, for mining and other things, but ESPECIALLY for RUNNING FOR YOUR FKN LIFE!!! when chased by frothing animals and whatnot.
This could be a disadvantage to ppl who chop trees then make buckets out of them, ie : bucket spammorz.
This could be an advantage to non-spammers, and ppl that are just generally lazy when it comes to right clicking on a waterflask all the time.
When equipped, and you right click on a bucket, the flower menu that opens could say, "Fill flask" as an option so as to avoid "ctrl-e"'-ing everytime you want to refill.
Proceed to the discussion portion of this suggestion...
...
...
...
Now.