The scriptures (Vedas) advise drinking with meals to aid digestion and offer them to the guests.
India is rich with various spices ,herbs,veggies aand fruits and many of them are unique to a particular area or region.Thus each reagion of India has some specialty drink .Like in bihar,for eg drinks made from sattu (roasted chickpea +berley flours) are had during the summers.
In western and south India ,coconuts are easly available and thus coconut water is frequently to beat the summer heat
Aam panna - is an indian drink renowned for its heat-resistant properties. It is made from green mangoes and is light green in color, and is consumed as a tasty and healthy beverage to fight against the intense Indian summer heat.
Nimbu pani (lemonade )this is the cheapest and might be the most used summer drink in india. you can add flavor to it by adding mint juice, roasted cumin powder, black salt or make it sweet – shikanji or have it salty. some people also like to add ginger juice but then ginger is heaty. in the western india, this is called as nimbu pani and in north india, its called as shikanji.
Buttermilk or chaas – Chhachh in North India, Mor in Tamil, Majjiga in Telugu, and Taak in Marathi
made using yogurt. popular in the whole of india. you can flavor it with mint, ginger, cumin powder or curry leaves and even do an oil tempering with herbs and spices. another variation is this mint chaas.
Falooda – a cold and sweet beverage containing many ingredients, such as rose syrup, vermicelli, basil seeds, tapioca pearls, and pieces of gelatin mixed with kulfi, milk or water.
Kesar milk – saffron-flavoured milk
Sattu – a foodstuff from South Asia consisting of a mixture of ground pulses and cereals
Jaljeera – its a spiced indian cooling drink also used as an appetizer or just as a drink. quite famous in north india.
Rooh afza – it is a sweet rose scented healthy syrup that is made with fresh fruits, vegetables, herbs and roots. you can add it to milk, kulfi, falooda, ice cream, phirni or have it simply with plain water.
Piyush – this is a smooth and creamy beverage popular in the maharashtrian and gujarati cuisine of western india. piyush is a bit similar to the popular beverage lassi. but in comparison, piyush is thick, creamy and sweeter than lassi.
Tender coconut water – if you are staying in a place where fresh coconut water is available easily in summers then you are simply blessed. it is one of the best and the healthiest option to beat summer heat.