Congrats on the new bike! I'm not sure I'm the best to offer advise, but here it is for what it's worth.
I personally use a camelbak for mtn biking. Reaching for a water bottle isn't easy, while riding, on the mtn bike. At least I cannot do it. I do, however, have a bottle cage on my bike. It's a nice option to have though.
The camelbak also serves a dual purpose of carrying tools, spare tubes, food, clothing...etc.
For night riding, you definitely need a good light. Not necessarily an expensive light. I'm sure someone here will have some recommendations for you. I have a NiteRider HID system, it is super bright!
We keep our bikes pretty clean. The only time we hose them off, is if they are muddy. Otherwise, we just wipe it down. If you get it wet, make sure you dry it off. You don't want parts to rust. Keep your chain clean & lubed.
Don't want to jinx myself, but I've had less than a handfull of flats on my mtn bike, in 3 years time. I think a lot of it depends on keeping the right psi in the tires. If it's too low, you'll get a pinch flat. Also, depends on the area you'll be riding, if there's a lot of thorns...etc.
Saddle height is personal preference, I think. There are people that run the same saddle height for all there bikes and those that don't. Being a roadie, you know you don't want the saddle too low. I'd just play around with it and wee what feels good.
I don't have any other advise, except to get out there and have a good time! I went from mtn to road and never had a problem. The reverse, I think could be a little more difficult. I love them both for different reasons. Good luck.
Kerry



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I hose my bike after a muddy ride while the mud is still fresh and comes off easily, try not to have it pressurized though.

