A few more things!
Puncture sealant may not be such a bad idea. Though you will always have somebody in the cities/towns/villages do it for you fast, cheap and good, once you are in the boonies, every bit of struggling at 4500m is something you want to avoid. i think you may be able to purchase this in Delhi.
Where do you plan to camp? Equipment can be hired at Leh as well as Manali and the whole area is dotted with hotels that are both good and cheap.
Please carry a lot of newspapers with you getting them is a difficult proposition in some parts, and they behave both as insulators (against cold) and boot dryers. An alternative to heavy waterproof boots (which will have your feet cook in Delhi), is to have a lighter, non waterproof pair + one set of overshoes, which do a great job of layering and insulating your feet as well. Besides, good overshoes such as Neos will give you a much better grip on packed snow as well.
Last, but not the least - antifungal dusting powder, esp if you have waterproof boots, and for the rest of your innerwear. Again available easily in Delhi, or anywhere for that matter, OTC.
Have a great time. Hopefully, most of the roads will have had some sort of repair by the time you reach there. The scenery will BLOW you away, as will the hospitality!