so the cauldron idea is instead of opening the watermill gui and juggling with and buckets in your hot bar cause your to cheap to make cells you can just fill a cauldron that is adjacency to the watermill and the watermill can pull from that. the cauldron is super neglected so as far as I could find bc liquid pipes don't interface with it so the watermill would be just as auto-resistant as it is now. the cost for this convenience is your sacrificing a block that could be passively generating power
the glass bottle idea is that you can use glass bottles as water cellsbuckets. after running the math it seems to cost around 1000 eu for 4 water cells1200 eu minimum for a bucket vs. 400 eu for 1 glass bottle straight from sand vs. over 1000 eu for a glass bottle from cobble the watermill will return an empty bottle
the "other liquids" idea is since watermill are supposed to run off running fluid why not be able to run it off any fluid? basically the water mill will fill up and run the same no matter what fluid you submerge it in or feel like wasting directly be it milk, coffee, booze, potions, lava, bio fuel cell, mod fluids like slime, oil, biogas, so on and so forth EDIT: don't forget mushroom stew (mooshroom power for all )just forget no one likes this. consider this part dead if you have nothing nice to say about it.
edit: just found out water bottles unlike empty bottles don't stack so replace cell with bucket in the above suggestion or...
4 glass blocks = 4 beverage bottles that stack and hold water or booze