If you damage cells and the proper materials are not available for repair, that cell or group of cells will die. Proper circulation plus a balanced chemistry will deliver the necessary new material and replace the damaged cells and remove the unhealthy, waste materials. The electrolytes help to flush out the waste materials. When your fluid level is up, your skin will feel warm and moist to the touch and will have elasticity and turgor. If the sodium level is high, the veins are usually up.
Some people crave certain soft drinks.
Although coffee and tea are fluids, the caffeine in them tends to act as a diuretic, and the imbiber may lose more fluid than gained. Diet 7UP may be all right for some people who know that they are alkaline and need the carbonate but a carbonated seltzer water is better. They help to main the proper volume of blood so the blood pressure is adequate to circulate the blood to all parts. I imagine you can get them at a health food store. Dr. Lendon Smith also has a product list order form on his web site.