Water Spider (or Mizusumashi) is a specialist role in lean manufacturing. This person is responsible for providing the raw materials where it is required, when it is required and in the right quantity (so that it lasts until the next refill). Their work allows for a smoothly functioning lean factory where operators only focus on value adding steps and there is uninterrupted continuous production.
An application-oriented question on the topic along with responses can be seen below. The best answer was provided by Dan Weigel and Sudhir G.
Applause for all the respondents - Vinayak Deshpande, Dan Weigel, Sourabh Nandi, Glory Gerald, Rakesh Naik, Sanat Kumar, Sudhir G.