See if the Amoxicillin can be switched to liquid form and flavored. Nowadays, some children's medications can be flavored. Ask your pharmacist about this.
The powder in those capsules are VERY bitter, so applesauce might not cover the taste very well. Check with your pharmacist and/or read the info that came with the medication to make sure you can even do this.
The pharmacist is a great resource for these types of questions.