(* groom)
* feed 6 fodder (energy: +5.8).
* ride [...] for 1hr (energy: -31.5, points: +3)
* carrot (energy: +8)
* feed 8 fodder and 12 oats (energy: +22.5).
* ride [...] for 1hr (energy: -31.5, points: +3)
* water (energy: +24, morale: +0) (with shower and fountain as you said)
* feed 3 oats (energy: +4.2).
* ride [...] for 3hr (energy: -94.5, points: +9)
* stroke (energy: +11.9)
* stroke (energy: +10.5)
* mash (energy: +10, morale: +0)
* ride [...] for 1hr (energy: -31.5, points: +3)

(* groom)
* feed 6 fodder (because they usually start at 94% energy and this is the maximum I can feed them without wasting energy)
* do the least amount of whatever they do (like 1h rides or 30' rides with the reindeer, one competition, ...)
* feed just a little less than required to get maximum energy, but also not too much fodder - if that's already just the maximum you can feed, try giving a carrot or something before doing so
* do the least amount of whatever they do
(repeat until you fed the amount you wanted)
* maximum length of their action (3h rides in this case, 6h (?) rides for reindeer or 4 competitions)
* stroke while the energy is lowest
* use remaining things to get energy - drink, carrot, mash
* maximum length of their action

I know some easier schedule (less amount of clicks required) for the planets but this one works there for me as well.