Don't Install It If You're Traveling
If you are traveling today, tomorrow or any time in the near future you probably want to avoid installing the iOS 9.0.1 update on your device.
If you're on an important business trip, you might want to wait until you get home so that nothing gets fouled up. If you're on a trip-of-a-life time, you might want to avoid a bump so that you're not dealing with issues (like camera problems, files mysterious vanishing, etc). That's the last thing you'll want to be doing in your cabana.
We recommend installing the iOS 9.0.1 update at home when you have easy access to your logins and potential fixes. You'll also have a lot more patience.