How to make flower fresh in Singapore

Singapore is hot, so water will be easily not fresh and smelly, which will make the flower stem also rotten easily. Then your flower will wither soon. To keep your flowers alive longer, following tips will help a lot: 1) Cut flower stem bottom at 45 degree angle last minute before you put inside the water, better cut every day. 2) Better change water often and wash flower stems. 3) Put some ice inside the water to make flowers fresh. 4) Better put at the cooler environment. 5) Put flower nutrient powder inside the water. ($0.30 per pack)