Well, there are many summer drinks, depending on which region you are in. Some of them are:

Aam Panna, Bel ka Sharbat, JalJeera, Shikanji, Neera, Ragi ambli, Jigar Thanda, Nannari, Kokam Sharbat, Coconut water, Chaach/ButterMilk, Thandai, Roohafza,

and many more...