Pictures would help. Is the joint in question the table top or a leg. I will assume it is a table top joint. Is the table old or new? Can you clean out the joint? To get a glue joint back together it needs to be cleaned out and smooth a possible. That is usually hard to impossible to do with joint repair. You need to clean the joint out as best you can. Use a sheet of sand paper pulled through the joint. Then glue needs to be applied into the joint. If you have a suction source, like a vaccum cleaner, you can actually suck glue into the joint where the joint is almost closed. Next, the table top needs to be clamped to pull the joint together. On the road you don' need to bother with a "proper" clamp. You can use one or more ratchet straps. The wider the table top the more you will need. Basically, it is get the glue in the joint then pull the joint together with the straps. As for glue, I would use Gorilla glue. Normal wood glue needs smooth surfaces to hold properly. Gorilla glue doesn't, it also fills gaps and preforms well with large clamping pressure.
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