You indicated that there are about 200 stands at market. Yet, there does not appear to be any directory of who the standholders are or where they are located, either in kiosk types of directory arrangements or paper directories that could be handed out at strategic points at market as visitors enter the market from different parking lots. Do the stands have numbers or names? I would think that it would be in the best interests of everyone--the owners and managers of the market and the individual standholders--to have some sort of directory. When I go to a mall, or even a large airport, I routinely look at directories to see which stores or food providers might have what I am looking for and where they are located. Some malls have multiple levels, and I would never think to wander level by level and store by store hoping to get lucky.
The market where your stand is located is subject to random visitations, by locals, tourists and other visitors who may not have a specific plan in mind when they arrive at market to check out the stands. If your situation is not conducive to steering visitors to your stand by the various methods suggested by other members, and management is unwilling to bring water to another, more conveniently located stand for you to move to, then why not consider creating a directory to at least let visitors know who and what is at market? The directory could be by category, such as used at malls, and one directory might be food, which would include pizza in your case. If you feel that the managers are not up to creating a directory, then maybe a group of standholders could do it. I would seek out the most influential and valuable standholders at market to be your allies in your case. I would perhaps do that even before confronting management on the matter. If veryone is treated equally, there should be little reason to discourage the creation of a directory. And, if a directory is created and people still do not visit your stand in sufficient numbers, then you would have to revisit the entire matter and your purpose at market.