I hope all goes well with your baby, at 2 1/2 months he's probably newly weaned and it is common for babies to regress a little and want handfeeding when they're in a new home.
It sounds like you got the formula he's used to already, which is good. If you aren't experienced at handfeeding, you should be able to just offer the formula on a spoon or from a dish you hold to his mouth.
Be sure to offer him some other foods that are easy to eat such as soaked pellets, oatmeal, or soft veggies.