Elevating your feet will not lower blood pressure and will actually increase the blood pressure reading when your feet are higher than your heart. On the other hand, if you are doing activities to relieve stress such as yoga (which often elevates your legs, such as legs-up-the-wall pose), then over the long run, these stress reducing activities may help to decrease your blood pressure (but it is not the act of elevating the legs that is lowering the blood pressure it is the stress relieving activity).
It is must to keep your body well hydrated and it is highly recommended if you are suffering from high Blood pressure. Drink about 8-10 glasses of water each day. You can also drink warm coconut or coconut water, along with normal water for best results. Coconut water is delicious and develops nutritional values as well. They help in controlling and lowering the hypertension levels. It is an easy and simple method to improve blood pressure level by just consuming coconut water regularly. Try to use coconut oil than your regular oil for cooking.