Vitamin C: yes (orange juice or other sources), pure Cherry juice or Cherry extract in pill form: Yes; Coffee: no.
Too much caffeine can aggravate gout, but drinking cherry juice and other dark berry juices (blueberry, strawberry) can reduce gout suffering. But the juice should be 100 percent pure juice, preferably tart cherry juice (although black cherry is also good, but not as effective as tart cherry).
Look up pure tart cherry juice gout relief and you'll find sources. Don't just get some off-the-shelf "cherry juice" drink from the grocery store. That will be made from concentrate and it's not 100 percent pure tart cherry.