Find out more here: http://cumberbum.tumblr.com/post/59864424764/cumberbum-expederest-sorry-for-the-low-tech
Word has it that Sherlock will be wrapping up the shoot for episode 3 today. And with a new footage coming out tomorrow, even though they kept saying that there's no confirmed air date yet but I suspect it should be pretty soon.
Anyways, brace yourselves, Sherlockians, for you are going to need it. Here's a list of basic 'survival' items you may need: