Where possible, I try purchase mini versions of what I buy for myself for Max. I find this works a treat! For example, Max refused to drink natural still water at home, until; 1) I realised he had to drink it at preschool, and 2) I started to purchase the small individual bottles for him.
I also found the same with the mouthwash. He considers himself a “big boy” now he has his own, and it encourages him to want to brush his teeth more.
A win-win situation!