Use water in any form possible to cool down fever .

According to this hadith, fever is caused by the heat of Hell-fire. This means that it is a punishment from Allah for our sins, and we should take it as an opportunity to repent and ask for forgiveness. To cool down the fever, we should use water in whatever form possible - drinking it or using wet cloths on our forehead or body. This hadith also teaches us that Allah's punishments are not always severe; sometimes they come in small forms like fever which can be easily cured with simple remedies like water.