Welcome to Just Answer and thanks for your question. Prune juice is much better than orange juice as a laxative. If you are going to the store for one though, you might want to try an enema to get things started since you know there is a large, hard obstruction in the rectum. You should also buy stool softener tablets (docusate sodium/Colace is one) which will continue to make passing feces easier. A handful of prunes or some juice will also help.
Orange juice has no laxative properties and you would need to eat a whole lot of grapes to make a difference in severe constipation. If hardened stool is what is preventing you from going, then even laxative won't help until that stool is broken up and expelled, and an enema is the best way to do that. If you are in a hotel, you can ask the concierge for information about contacting an English-speaking nurse or doctor who can tell you where medications are available.
No, it does it with an enema. Just instilling and retaining the fluid for a few minutes helps to get the process started. Commercial enemas also have a blend that coaxes fluid into the lumen of the bowel to further soften the blocked stool. You can then expel it more easily in your bowel movement.
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