If your perculator has a plastic top you can replace it with https://www.lehmans.com/p-32-glass-percolator-tops.aspx
I've replaced a few in the past. As for the tea infuser method I have one, the flavor is good, I just use a course grind. So i don't get to much sludge.
Having used the cold process coffee a lot underway (2-3 gal batches twice a week) its great hot or cold but if not kept in a fridge or inside an a/c duct it got about 3 days before mold sets in. That stuff kept the engines live and the lights on.