We bought 2 pekin ducklings about a week ago and we are now going to convert my daughters old playhouse into a duck house where they can be locked up at night. The ducklings might be about 2 weeks old now not sure how to tell. They are currently with our chicks. Question is... Can I have a bowl for water and tape half of it closed so the can't get into the whole thing or should they be fine? And we still have a heat lamp. When do we stop using that on them?