Five or six days, depending on how many times you take the means of transportation, generally speaking, 25 Singapore dollars is enough.
Younex badminton rackets and rackets, Nike basketball shoes, running shoes and sportswear can all be bought at the Royal Gymnasium, where there are quite a variety. There seems to be a Nike store next to the Royal Stadium in Takashimaya. Another option is Changi City, next to the Expo station, and there is a subway station from the airport. There are many sporting goods stores, including Royal Sporting Goods Store and Nike Store.
There is milk powder in the supermarket. Such as NTUC cheap shops and business songs are easy to find. In the hotel, you can ask if there is a supermarket nearby.
Medicine depends on what you want. Most medicines can be bought in Guardian.
Suitcases can be bought at Takashimaya Takashimaya, and there are many good ones to see. And the whole shopping mall is very big and there are many things. As mentioned earlier, you can find sporting goods and medicines here. Take the subway to the orchard subway station, and then you can ask people how to get there. You must go through the Wisma atrium of the shopping center. But it's quite convenient.
Souvenirs can also be settled at the airport duty-free shop. You can buy some Merlion or Hu Jihua-shaped souvenirs and durian products. There are also many good suitcases at the airport. Choose more if you buy it at the airport customs.
For Singapore students, please use O (∩ _ ∩) O. Thank you.