I've never had a problem with water in my CAI.
As for those of you who are wondering, it's called "hydrolock"
Hydrostatic lock, hydraulic lock or hydrolock occurs when liquids, typically water, enter an engine cylinder. This can occur from a coolant, oil or fuel leak, but the chief cause is drawing water into the engine through the air induction system (airbox & filter, ducting, throttle body or carburetor, intake manifold). Internal combustion engines (spark or compression ignition) operating on a two-stroke or four-stroke cycle must employ a compression stroke to compress the charge (usually an air/fuel mixture). Liquids are incompressible; the presence of a liquid in the engine cylinder during the compression stroke generates destructively high cylinder pressures.