since i only make 1 gallon batches i can tell you that:
1 package works fine
i've only activated my yeast once... normally i just toss it in and go.
umm... iirc Hawaiian punch used to be sold in concentrated cans also. that may be a better route.
planned: cherry lager, lilac mead, rose hip, some kits
started: mead, apple cider, cowboy lager
clearing: elderberry,welches wg/ras, starfruit
Aging: pear, peach
Finished: spiced mead, apple, grape kit, hot pepper, Wild Grape, Lemon Ginger, crabapple, blueberry/pear, orange/pineapple
(all 1 gallon)