I know that we are supposed to stop drinking 30 mins before/after eating. Did you apply this rule to the puréed stage, or did you begin it when on soft foods? Also, do you continue to drink before/after having a protein shake, or do you apply the 30:30 rule to liquid meals as well?

Yes, 30/30 applies to puréed food! When I take my protein supplement, I try to stay away from liquids, but once it a while I'll take a small sip of water to help bring down the shakes.