Your dry mouth very could well be just that you're dehydrated from not drinking enough.
Remember at this early out, you can't swallow a lot at a time (which you are painfully aware of), so you'll have to sip, sip, sip all day long. Tha****er bottle should be next to you all the time, and keep sipping. Again, not sure how it's hurting (please provide details in your post if you want help!) One thing that helped me with pain was to drink room temperature water, and not cold water.
Each day will be a little better than the last - but you've got to keep your fluid intake up or you'll have to be hospitalized, potentially. Not enough liquids will also slow down your healing and keep you feeling like this longer.
Heaviest weight: 310 pounds (Male, 5'10")