Question: what can you buy in 1 rupee?
Answer: Candies and Toffees. Dairy milk eclairs, mango bite, coffee bite... the list is huge.
Machine ka Thanda Paani. For one more rupee, you can even ask for salt and lemon.
Two Single Postcards. ... 
Matchbox. ... 
Plastic cup/glass. ... 
Mouth-fresheners like Chutki and Pass-Pass. ... 
Chewing gum. ... 
Shampoo sachet.