First Test for Water
Anhydrous cobalt chloride paper is blue.It can be obtained by warming light pink hydrated cobalt chloride paper in a test tube with a gentle flame. (As seen in the picture on the left)
CoCl₂.2H₂O → CoCl₂ + 2H₂O
Blue cobalt paper will turn pink when the blue paper is wetted.

Second Test for Water
Use white anhydrous copper sulphate which will turn blue when it is hydrated with 5 molecules of water per formula unit. Kindly refer to Mr Peter Lim's coloured QA book for more details.

Third Test for Water
When solid ammonium carbonate is heated, it thermally decomposes to 2 gases and a vapour. They are ammonia gas, carbon dioxide gas and water vapour.
(NH₄)₂CO_3(s)→ 2NH_3(g) + CO₂ + H₂O_(g)