I do not know where you live. Yet, to insure yourself against cold and even fever, please take a small amount of amla juice that is now manufactured by the likes of Apollo Pharmacy and whose outlets can also be found everywhere. If you come down to Chennai or any other town of Tamil Nadu, please do buy four packets of what is called "Nila vembu" herbal preparation. You have to just take one teaspoon of this mix, add it to 50 ml of pure water and heat it for twenty minutes. Then add a little village jaggery (if you dont find this in your place, you can add a little sugar) and take it. This will increase your resistance power. This will remove all infections from your body, particularly any virus that you have got in your body. If you come to Chennai, you can even go over to the National Institute of Siddha ( just opposite the Tambaram Sanitorium Railway Station) and you can speak in English to understand more of these medicines. Please do note to be there before 8AM, as treatment is one hundred per cent free. Some six thousand patients come here everyday.
Make it a habit to consume boiled cups of spinach everyday. You can choose any variety. According to many doctors of alternate forms of Indian medicine like Siddha and Auyurveda, these will remove all toxins from your body. As such, please avoid any packed food that has preservatives. Even home made pickles are far better. To give you a simple example, in hundreds of thousands of homes in the entire South India, in the month of April every year, the grandmas will become very busy. They will buy the small mangoes from the market ( small means very very small, called Vadu maanga in Tamil) and make a pickle at home. These small mangoes are put into a mix of some oil like castor oil and some spices and fermented. This small mango is then eaten after four days, The preparation lasts for as many as ten months. Literally till Feb the next year. You can ask some old lady from South India and she will give you this recipe. This is particularly superb with curd rice.
In any case, consume only fresh boiled RO water and avoid taking any water from outside. Similarly, take curd of half a cup during day and one cup of milk before you go to bed. This makes your bowel movements perfect. One banana eaten at bed time is also very good.
Once again, you can consume just one tablet of what is tribala, a herbal medicine everyday, early in the morning. This is a herbal preparation and increases your resistance power. Never go to an allopathy doctor for ordinary ailments. If you have cold, and no fever, take the thulasi leaves, wash them well, and just boil a few in good plain, clean hot water. Cool it, filter it and take it. Village jaggery ( I dont know what this is called in Hindi, and whether it will be available in your place) or jaggery is okay. The cold will come down immediately. You need thulasi water treatment, thrice a day. Only if you have continuous fever, you need to consult the doctor. Please do note that many allopathy doctors make a huge amount of money by charging the patients huge amounts for just a casual consultation and prescribe harmful antibiotics too. These affect one's health in the long run.