Greetings,

dehumidifier
===============
Running a dehumidifier would work -- but would cost a very large amount
of money through the years.

heat tape
==============
Heat tape might not work! This is because when you are flowing cold
water the heat tape will have very little time to warm the water. It
also costs money and is an ongoing expense.

pipe insulation
=============
Pipe insulation WILL WORK but you might have to insulate the entire run
of pipe. You could start with your basement and see how much it helps
but if you are getting condensation elsewhere you will need to wrap
those areas as well.

Hope this helps,
William