Milk is considered a blessed drink created by the Almighty Allah. It is both a food and a drink at the same time. Regarding Milk, Allah Azzawajal says in the Holy Qur’an,
"And indeed, for you in livestock is a lesson. We give you drink from that which is in their bellies, and for you in them are numerous benefits, and from them you eat."
Allah the Exalted also mentions Milk as being present in Paradise;
"Is the description of Paradise, which the righteous are promised, wherein are rivers of water unaltered, rivers of milk the taste of which never changes, rivers of wine delicious to those who drink, and rivers of purified honey, in which they will have from all [kinds of] fruits and forgiveness from their Lord, like [that of] those who abide eternally in the Fire and are given to drink scalding water that will sever their intestines?"
Rinsing the mouth after drinking Milk is from the Sunnah.
It is important to rinse the mouth with water after drinking milk as this was the Sunnah of God’s beloved Messenger (pbuh) who once commented, because “it contains fat.” - Narrated by Ibn Abbas (radhi Allahu anhu) recorded in Sahih al Bukhari in Volume 1, Book 4, Number 210
The milk must come from an animal which is fed an organic vegetarian diet.
Nowadays, the milk sold in supermarkets in the West is from commercial dairy cattle which are pumped full of harmful vaccines and fed on a diet which contains meat by-products and fodder which is sprayed with pesticides and chemical fertilisers. There is no doubt that these toxins find their way into the animal's meat and milk.
Abdullah ibn Umar (radhi Allahu anhu) narrated that the Messenger of Allah (sallAllahu alayhi wasallam) prohibited eating the animal which feeds on filth and drinking its milk.Sunan Abi Dawood. Book 27, Hadith 3776. Classed as Sahih by Sh Al Albani (rahimullah).
There is no harm in mixing milk with water as per the following Hadith;
It was narrated by Sahl ibn Sad (radhi Allahu anhu) that a drink (milk mixed with water) was brought to the Prophet (sallallahu alayhi wasallam) who drank some of it while a boy was sitting on his right and old men on his left. The Prophet said to the boy, "If you permit me, I'll give (the rest of the drink to) these old men first." The boy said, "I will not give preference to any one over me as regards my share from you, O Allah's Apostle!" The Prophet then put that container in the boy's hand.
Sahih Al Bukhari Volume 3, Book 47, Number 774
According to the Dairy Council, the benefits of drinking fresh milk include healthy bone growth due to milk’s composition of calcium, phosphorous, protein and magnesium, and the healthy growth of teeth in children. Milk along with a balanced and healthy diet helps reduce blood pressure, instances of type-2 diabetes, some forms of cancer, cardiovascular diseases and obesity. A little honey can be added to milk that has been gently warmed up and then mixed thoroughly. This sweet milk should then be chilled before drinking. It is important to note that milk sweetened with sugar rather than honey causes plumpness of the body and face.
Raw Organic Milk vs Processed Milk.
Without a doubt, raw milk is better for health than the processed and pasteurized milk which we buy at the market. Raw milk contains more nutrients, natural enzymes and probiotics.
The pasteurization process destroys milk's natural enzymes which help the human body assimilate the calcium contained in milk, as well as its other nutrients which the human body needs to grow, fight disease and function well. That is partly why breast milk is far better for babies that formula and also why, by the same token, raw milk is better for everyone than processed milk. Having said this, it's important to source your raw milk from farms where the milking animals have been vaccinated for contagious diseases like TB and Brucellosis and are fed a vegetarian organic diet.
85% of those who are lactose intolorant should be able to digest raw milk without any problems and raw milk does not spoil like pasteurized milk does if it is left out of the fridge overnight and can much easily be made into homemade butter, cream, soft cheese etc.
Organic Raw Milk (London and Home Counties) - http://www.hookandson.co.uk/index.html