Welcome to BCMTouring Nomad. As far as accommodation goes, it shouldn’t be tough on the Srinagar – Leh route, though I would recommend that you carry a tent and sleeping bag for backup.
Also you might want to consider taking a bus till Sonamarg or Zoji La pass and then biking from there to Leh. Since the route till Sonamarg isn’t that safe and is filled with senseless traffic. Once you cross Zoji La pass, things are much safer since the whole area is under Army control and there is almost no terrorism there.
As for bike and gear, my recommendation would be to bring in things that you are used to. Since India doesn’t really have that good homegrown adventure biking gear or bikes, so most of the quality stuff here is imported and costly. Check out
Firefox’s site, it should give you an idea of things available in India.
Do let us know if you need more info...