I was flying near a lake yesterday. I got "OK to fly, non GPS." Never got that before, but figured the "ok" was all I needed. Take off was fine, but then aircraft wouldn't hover and became erratic, hit branch and fell into the lake, getting completely submerged for about a minute. No apparent damage, other than wet. I dried things off with towels and a hair blower, and wanted to open it up to do more, but it looks there are some unusual hex fittings that I have no tool to open. Any ideas on how to dry out the aircraft and the battery? If that doesn't work, where can I send it for repair?