My advice for you
Find the source of the drips and repair , most likely its leaking from a separated joint from a drain but it could be a steady drip from a water pipe..
Remove all of the remaining 4x8 drywall sheets from the damaged area as more than likely they will be damaged / moldy.
After the pipes are repaired you can insulate them with a flexible wrap. put a vapor barrier over the floor joists then re-drywall.
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