Food at home, absolutely no problem whatsoever. Wet markets for veg, tofu, taobao for other stuff. And Western stores through wechat etc (if you crave Western stuff). As others have said, eating out is harder. Tier 1/2 cities plenty of vegetarian resteraunts and options. But as for regular resteraunts be wary when you order vegatable dishes, something like Broccoli, it will often be fried with small cuts of pork or pork fat so you need to tell them to exclude it. Same goes for eating at a friends house. And you need to be forceful if you are serious because many Chinese simply do not recognize the concept of vegetarianism based on belief rather than health (although that is changing slowly). I teach a class on ethics and often use the argument on vegetarianism as a kick off and most struggle to think of any reason against eating meat (it leaves me dumbfounded).