If you're hosting a slumber party, providing breakfast is a must. Start the morning off with India's favorite and most famous drink Chai. If you recall the Slumdog Millionaire's main character, Jamal, worked as a chai runner, serving tea to the higher ups in his company.
Masala Chai is made by brewing black tea with whole spices such as peppercorns, cardamom, cloves, cinnamon, and ginger, and adding milk. Chai is traditionally served hot, but can also be served iced, similar to iced coffee which is now such a popular summer beverage. There are several "chai cheats" sold in grocery stores so that you won't have to purchase all the spices necessary to brew it from scratch; chai tea bags, powders and syrups are available. Chai-Direct, has a wealth of options when it comes to chai and their taste-o-meter rating system can help you find the right brand for your tastes.
In addition to your breakfast beverage you'll need actual food. A simple fruit salad or fresh fruit tray is both healthy and easy for girls to nibble on throughout the morning as they finish up their spa treatments and do their Bollyrobic workout.