When Katniss is severely dehydrated how does Haymitch Abernathy indicate to her that shes near water?

In "The Hunger Games," Haymitch Abernathy signals to Katniss that she is near water by sending her a message through the gifts he sends from the sponsors. He specifically sends her a container of water, indicating its importance and guiding her towards finding a source of water in the arena. This gesture helps Katniss understand the necessity of locating hydration for her survival.