Liquid supply systems, spout support tools, and methods of using

A retaining method of a liquid supply system, comprising:

• providing a liquid-containing container made up of a rectangular parallelepiped box comprising a wall with an opening formed therein, and a collapsible insert including a liquid-containing portion received within the rectangular parallelepiped box, the collapsible insert including a spout with a flange wherein the spout and flange are retractable through the opening in the wall;
• providing a support tool comprising a body having an engaging portion and a grasping portion extending from engaging portion, the engaging portion including a first engagement surface and a second engagement surface opposite the first engagement surface, and a spout receiver formed in the engaging portion that is configured to receive the spout of the collapsible insert;
• and
• grasping the grasping portion and inserting the spout receiver of the engaging portion over the spout such that the first engagement surface is provided in contact with the flange and the second engagement surface is in contact with the wall, thus preventing the spout from retracting into an interior of the rectangular parallelepiped box.