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The car will not run without the MAF or the vacuum points along the intake, so you'll need to replicate those in your build. The projection (how deep the MAF extends into the air stream) and the overall diameter of the piping will be critical. Otherwise, you can through a CEL, which will cause the car to run in a degraded mode to protect itself.
As for getting the filter wet being bad - depends on the extent of "how" wet. If the filter end gets completely submerged under water - that would be a bad thing. Would hydro-lock the engine in the heartbeat there. If it gets a little wet or get water splashed on it, no big deal.
Also note that gains will be minimal for this mod. You might get better throttle response and much greater intake sound (since you will be bypassing the resonator in the OEM system) - but don't expect much more than a 3-5 HP gain, tops.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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