Of course not, and if you've ever been to the tropics you'd how impractical it would be to restrict the drinking of water.
Other drinks, like tea or coffee etc it would depend on what times lay people offer it to the monks, suffice to say that afternoon tea is one of trhe highlights of the monastic day, though no milk after noon.
"Right effort is effort with wisdom. Because where there is wisdom, there is interest. The desire to know something is wisdom at work. Being mindful is not difficult. But it’s difficult to be continuously aware. For that you need right effort. But it does not require a great deal of energy. It’s relaxed perseverance in reminding yourself to be aware. When you are aware, wisdom unfolds naturally, and there is still more interest." - Sayadaw U Tejaniya