how to buy co*dms!?

gonna meet and we are planning to do it for the first time tomorrow. but how to buy condoms in delhi!? ill reach by train then have flight back home should i just go to the medical stores opposite to the NZM station and ask for condoms but idk the specs like what condom i even want or should i go to the supermarket and get it but will it be awkward to walkin and then get a single pack to the billing counter!? not ordering online.