Holy Water

I'm going to a baptism on Saturday. I'm kind of worried. Is this one of those events with holy water? If I get some holy water splashed on me how badly will it burn? Would it be wrong to bring a plastic tarp like the first few rows at a Gallagher show? I think my only hope is if god made a coding error and wrote holy water burns if Jew XOR atheist instead of Jew OR atheist.