Every time you feel that your fever is rising drink one liter of water immediately and within 5 to 10 minutes you should sweat and the fever is gone. To subside further drink a lot of tea made of ginger, cinnamon and honey. (about 5 to 7 cups a day). Within two days you should be 100% ok. (The lemon/lime drink should also help in malaria, though I did not try it due to unavailability).

Food poisoning:

The moment you feel that something is wrong with your tummy treat yourself with water. Drink a lot of water, 3 – 7 liters, until the bad effect has subsided.