I'm not necessarily happy with this alpha either, but at least try to play a little before coming here to complain because it's different from what you're used to? Roland and the other TFP defenders (err.. mods) already have a habit of dismissing complaints with "you just want it to be like A18", don't give them more reason to do so, please.
All drinks give a short stamina regen boost afaik, with coffee, beer and megacrush offering a longer buff. Red tea and filtered water (the kind you find in water coolers) make it so that you build up less hunger while swinging away at things. If you plan to use sledges or heavy tools intensively, you will have to either stock up on those or accept that you'll get hungry quicker (which leaves you less stamina to work with). It's a pretty big difference in my experience, at least early on.
Also, just to be sure: power attacks are terrible for mining purposes. (edit: I'm not entirely sure but I think armor penalties may apply as well, which could make a big difference if you're wearing heavy stuff without the perks)
It's a little too heavy on the micromanagement imo, but it's definitely doable. Your mileage may vary if you want to do a ton of mining in early game which will be harder if you haven't stocked up on the aforementioned resources indeed. But if you have 3 points in Sex Rex and an iron pick, you should be able to mine quite a bit.