Spilled lemonade in central console

I would bet the liquid was most likely absorbed by the carpet and/or underlayment (or sound deadener ... whatever you want to consider it). Some may have gone out the holes as you are thinking, but I think I'd be testing the carpet in this area to see if it feels wet or sticky. If so, use a carpet cleaning machine on these areas to get the residue out. I personally have a small one I use for just such occasions, or when I need to clean the carpet in a car I'm trying to flip.

The major thing you need to worry about here with the liquid, especially sweet/acidic liquid like lemonade, is it has potential to cause corrosion. If you don't get the majority of it out, it may cause issues down the road. You will most likely never get all of it out, however, getting the lion's share will definitely help. If you don't have a carpet machine, try using just dry paper towels, which should be absorbent enough to handle most of it. Press it into these areas using force to squeeze the liquid out of the carpet and the towel will pick that up.