What's the healthiest option for juice for my 2.5 year old...?

Okay I know juice isn't the healthiest but I struggle getting fluids into him. He has milk for breakfast lunch and dinner (doesn't touch it usually) and during the day e always has water available to him. I'm mostly lookibg for juice for snack time. I shop at metro in Canada so I'm not looking for organic weird things....just common basic juices. Which one is best to offer?? Thanks 😊 no mean comments pls 

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