If the drops work for you and your son, then great. If not, there are ways to get the pills to be much easier to take. Also, in my experience, the supplements get very expensive very quickly. You're probably looking at a lot closer to the patch.
Extended release capsules typically have to be swallowed whole just because of the way they are designed to dissolve over time. Immediate release tablets however, can be crushed and mixed with a spoonful of applesauce without changing their effectiveness.
If I were you, I'd talk to the doctor again. Either (s)he can give some guidance about taking the pills, can prescribe something else, or can not in the chart that DS is on the supplements so there aren't reactions down the road.