Need tips on how to get my rats to take their medicine!

My new little guys both have confirmed upper respiratory tract infections. I’ve only had them a month, so they’re still skittish and not totally used to me. The antibiotics are banana flavoured which the vet assured me, rats love. Hard nope on that! I had success for the first 2 days mixing it into a tiny amount of plain yogurt… but already one of them is sick of it, and I still have 8 days to go! PLEASE HELP! What’s a kitchen staple I can use?! I have to work a long day tomorrow so won’t have time to go to the store. Advice appreciated thank you.