because he was trying to send her signals not to give up yet and that she was almost there. at first she thought it was because he disliked her but then realized he was saving it for when she was nowhere near a stream and desperate.
Chat with our AI personalities
Because he knows that if katniss really wants water and tries to find it she will get it. And also believe it or not, water was probably just as expensive as Finnick's trident
Because he is telling her she is really close to water and she should keep looking
Because he's trying to tell her (by not sending it) that she's already found it- It'd be a waste of the money he can get from sponsers and detrimental to her survival
In The Hunger Games, Haymitch didn't send Katniss water because he knew she was close to water and could find it herself.
Haymitch's second instruction for Peeta and Katniss are to find water.
well since Haymitch is always drunk he told them, "here's some advice STAY ALIVE"and when in the arena to get to a source of water first. Or just read the first book.
"Don't run to the cornucopia. It's a bloodbath... they are trying to pull you in. Just turn, run, and find water. Water is your new best friend. Oh, and don't step off that pedestal early, or they'll blow you skyward. You can do this... I know you can." -This is to the best of my memory from the movie-
Katniss got:burn medicinebread from district elevenbroth (that she gave to Peeta)a big basket of rolls, stew, rice, water etc.and sleep syrup (for Peeta).
Haymitch sends her a spile and they stick it in the trees after creating a hole so that the precious metal would not be ruined, and water comes out of the tree when positioned at the right spot.