The answer to 'best water line replacement' is to hire a licensed and experienced plumber to replace your home's water supply line. Water line replacement is a complex and potentially dangerous task that requires specialized tools and expertise. Attempting to do it yourself can lead to serious damage or injury.
A professional plumber will be able to properly assess the condition of your existing water line, determine the best replacement materials and techniques for your home, and safely complete the work to ensure a reliable and long-lasting water supply. They will also be able to obtain any necessary permits and follow local building codes.