Please help

Randi

Hello, so I recently switched to exclusive formula feeding. I get Similac advance through WIC. We are about 5-6 days from being able to get more but are running low. Can I buy the target up and up brand that says it’s the same as similac pro advanced? I’ve heard mixed things about mixing formula but I wasn’t sure if that meant like actually mixing in a bottle, mixing unlike brands (Enfamil and similac but not same bottle) or what!

Thanks!