My idea is a simple QOL mod. In crafting recipes like Immersive Engineering's treated wood planks or Biomes o Plenty dry sand to sand where it requires a bucket of fluid, I would like a tank that holds multiple buckets for the specific purpose of crafting recipes like that. Maybe something universal if possible so anything from mods that require this kind of craft a tank can be substituted and multiple crafts can be done without having to run back and forth or fill many buckets swapping them out one at a time. Also thinking there can be many levels that require differing levels of mats holding increasingly more but not ridiculous amounts of fluid.
You could have like a basic and advanced version of this as well where say the basic holds 1 type of fluid 2nd tier 2 types and 3rd tier 3 types... This sounds like an amazing mod though as its a pain crafting with fluids especially if you need a lot of the item