Boil the grapes in 1litre water for around 10 mins.
Now take out all the grapes from the water into a mixer grinder.
After it cools, grind the cooked grapes well and add it to the boiled water using a strainer and mix it. Now you will get a semi thick grape pulp.
Add sugar and lime juice to it and boil again for 5 more mins.
When cool, transfer the squash into a dry bottle or container and refrigerate. To serve, take ¼th glass of squash and mix required water with it. Add sugar if needed.
NOTE: You can make more than 15 glasses with one bottle of squash.