Maybe see if he likes sour candies? Or bitter things like grapefruit? You could make grapefruit candies. I think the best thing to do would be to find a substit

Maybe see if he likes sour candies? Or bitter things like grapefruit? You could make grapefruit candies. I think the best thing to do would be to find a substitute because continuing with "battery fakes" isn't a long-term solution.