Big Basket is India's biggest online super market that delivers to over 10 cities. They deliver essentials and other products at your doorsteps within no time. Due to the lockdown imposed due to Covid-19 however, the delivery might take longer than the usual time which is 24 hours. You'll have to wait for a free slot, plus some supplies may be low. However, mornings are the best time to book a slot and get everything you need.