There is a medication called pilocarpine which for some can increase saliva. It takes a little while to build up in your system to properly work. Not everyone has success with this medicine. Personally, I hated it. It caused me to sweat more than any change in my saliva.

Since you are only 3 weeks post rads, you still have a long road to go with your recovery. At this point you have just came out of the tunnel. Most patients have many ups and downs and several set backs during their recovery phase. For at the very least the first year post rads your intake needs to be at least 2500 calories and 48-64 oz of water every single day. Even taking in 3500 or more calories daily isnt too much during recovery. This is what will help you to recover and hopefully avoid too many set backs. Many patients get discouraged and frustrated with their lack of progress during recovery. Two years is how long it takes the body to rebuild itself after going thru OC treatments. Most will notice improvements here and there during that time in their sense of taste and saliva.

Be cautious with when blending your own meals. Calorie counts and a complete daily nutritional balance of all essential vitamins and nutrients are hard to manage when making your own 'formula'. Adding some high protein whey powder will help with healing. Also, home made concoctions can clog and breakdown the tube so always rinse thoroughly after a feeding. The rinsing will also help you to increase your water intake.

Hang in there, the worst is behind you. Best wishes with your continued recovery.