Let us move liquids from large bottle to small bottles.

We can click and drag small bottles onto large bottles to transfer the small's liquid to the large (assuming there is room and they have the same contents, of course).

But the same does not seem to be true in the other direction: drag a large over a small, and nothing happens - or at the least, I've not been able to make it happen so far :)

Being able to do this would let us empty a large bottle with a few units of fluid, thereby letting us use the large to hold a different type of fluid. This would be helpful especially earlier in the game, when the epoxy needed to make a new large bottle may be scarce.

Also, just as a general principle, it's good to not surprise the user with non-orthogonal UI functionality (after dragging small to small and small to large and seeing fluid transfer, they expect small to large to also work, yet it does not).