Oldmate....do you remember how long you let it sit in primary? Im going on 6 weeks on the 30th. Im still seeing airlock activity, althought it every 30-40 sec's.
From memory I left it until it cleared then transferred, backsweetened and bottled all in one go. Rehydrating with cold water won't matter at all as mentioned above. Really happy to hear you're all enjoying this as much as I am!