Does it have to be Gerber brand?

My baby will be 7 months soon and I started to give about half an Oz to 1 Oz of juice after baby food I buy the little Gerber juices but they only last 2 days after opening and lo only drinking about half an Oz I trow almost every thing away. What juice lasts longer after opening?

    Personally I don't give my children any juice. But if you are going to use juice I suggest getting juice that is 100% real fruit juice with no added sugar. If you are getting regular juice just water it down. I don't think you have to buy special baby brand juice.