Hello Ikelley,
Congratz on having your surgery done :)
Day 4 seems to hit everyone pretty hard, it'll get so much better I promise!
Mouth was so swollen in the first few days, I struggled with anything but water.
For the thicker medicines I used a syringe, I swapped cheeks to stop it aching so much, my other medicine was soluble, so I mixed it with my water bottle.
I was given a cool water bottle in hospital, its got a hole in the side where a straw is placed, so you can squeeze the bottle rather than put pressure on your mouth by trying to suck up your liquids. The nurse said a lot of people try sports bottles too, so maybe have a look for something like that :)
As for talking, the first two weeks I was mostly grunting (I do have a wafer in though), this 3rd week I can be understood a lot better, I can't make any hard sounds, b's and p's are hard, but I'm getting there. My boyfriend tends to understand me better, we are assuming this is because he can translate me when I'm drunk!
It will all get better for you, day 6 was a turning point for me and I felt a little more human and everything was a little easier.
All the best!