if you had any significant amount of water in your oil, it'd most likely be frothy.

around this time of year on the east coast, I sometimes see the white stuff under the cap. freaks me out, but when nothing goes wrong, I realize it was just moisture, most likely from the temperature swing over night, going from warm afternoons/evenings to very cool overnight. I only have breathers on top of my valve cover and not any sort of EGR or PCV, so stuff that would normally burn out in std. combustion, seems to stick around a little in my truck. it goes away.

if your oil was oil, and not milky looking, you're prob. fine. keep an eye on it. pretty sure if you had any sort of significant internal water leak, once the system pressurized, you'd be seeing a lot more than just a teaspoon.