Quite the contrary, I wouldn't suggest using creative. There is a simple feature that can solve your problem, holding f will refill multiple items very fast. Works with bottles, pouches, batteries and anything that is related to transferring between grids and held items. It is not explained anywhere, that's my bad. It even fetches from ship's inventory. Automatons getting more actions is already on my list like automated crafting of specific food/resource to maintain stocks or auto smelt ores or what you suggested to dump fluid pouches in tanks. Also on my list is another tier for pouches to be able to carry larger amounts of fluids, especially when you have multiple colossal tanks worth of fluids to haul between bases and your ship.