As far as coolant goes you can try the Caltex orange coolant. The usual ones available in the market are green. I use honda coolant in my car, it's expensive (Rs.400 per litre) but since coolant lasts several years, I don't really mind the one time expense. Keep in mind that there are two types of coolants. Type 1 and Type 2. Type one you need to add water to. The usual coolant-water ratio is 50-50. Type 2 is premixed and you don't need to mix it with water before adding it to the radiator. Read the label before you buy.
Also, here's a tip for you that is a lifesaver during an overheating emergency. If the car overheats due to any issue. Turn your heater on, turn the knob all the way to hot and turn the recirculate button to let external air in. The heater core acts like a small radiator and if the fan on your radiator fails to work or your car overheats due to any other problem, the heater will function like a back-up radiator and will lower the temperature and allow you to continue to drive at low speed without getting the car overheated.