It will not be anything to do with the piping. It's inert and can't cause that. I assume you've determined that it's not dissolved air in the water which will precipitate out after a few minutes?
If it is coming from the hot and cold faucets, it's sounds like something to do with the water source. Do you have a filter of any kind? If so, that could be introducing something into the water.
With the hot water side of things, the water sits in the tank between uses and you *might* think it's something within the tank. But if it's happening equally with the cold side too, there has to be something in common and about it could be is the source water, unless you have a filter.
Where are you camping? If on a municipal system, I would highly recommend that you call the local Water District and ask to talk to the manager and have a discussion with him/her. I did that earlier this year in Wa. and got some great info. that I couldn't have gotten elsewhere. If you are on a private system (groundwater or surface water) I would ask the CG if they have any test reports. If no luck, I would go somewhere where you can connect into a municipally supplied faucet and see what happens. Does it happen at home?
If you are camping in the same general area, you could always get a test done at a water testing lab. May cost around $50 or so but you would hopefully know for sure if it's the water or not.
