In addition to proper roadside shops, fruit stands (typically rolling carts) are also quite common. Fruit is abundant and extremely cheap. A glass of freshly squeezed fruit juice (or milkshake) typically costs the equivalent of about 25-50 cents (typical choices: tangerine, sweet lime, mango, pineapple, grape, watermelon, sugarcane).

I was shocked to discover that navel oranges are not widely available (except for expensive speciality shops). Indians think that tangerine is orange. Even the Tropicana "orange" juice that you buy in India contains tangerine juice.