Cranberries like an acidic soil so need to be planted in ericaceous compost and watered with rain water. They are a low growing, ground covering plant and can be grown in hanging baskets so should be fine in a container. They have a shallow root system so it won't need to be a very deep container and I would use a 15 inch wide pot.
Grapes need a large container but not black or dark coloured as this attracts the heat and grapes like cool roots but need a nice sunny spot. I would suggest John Innes No.3 compost. Re pot everything now and keep as much soil on the roots as possible and water straightaway.
The red currant is a puzzle because they grow as a bush not a climbing vine so it must be a different fruit. Has it got a label attached to the plant with hopefully a variety on it?
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