1. Put a carbon filter on your intake.
2. You could continue running from outside and use a climate controller.
3. Are you sure you even need an intake? I have mine in a tent in the basement and even though I have an intake installed, I don't run it as I don't need it and it messes with my negative pressure.
4. Even if you did bring in more dense wet air, your dehumidifier should suck that wetness up.
5. Make sure you have good air flow or air movement. Your fans inside the tent ( i run wind devil) i think is more important than an intake fan.