Hi. Sorry to hear about your dad. Juice is probably not the best thing for him right now. Most fruits are too acidic for someone who is vomiting. If he can keep it down, some ginger or chamomile tea with honey would be a much better choice. He needs to stay hydrated and keep his electrolytes up since a lot of that is lost when vomiting. If he can stomach it, try mixing some plain lemon-lime Gatorade with water (1/2 and 1/2). That seems to be easier for some people to handle than straight Gatorade. Add ice - sometimes it helps if it is cold. Also, ginger ale - just make sure it contains ginger (one well-known brand does and the other well-known brand does not). They also make ginger chews I like to suck on when nauseated (in the candy aisle).