The answer to 'how to fix water line' is to first shut off the main water supply to your home. This will stop the flow of water and allow you to safely work on the damaged or leaking water line. Next, locate the break or leak in the water line and assess the extent of the damage. Small cracks or holes can often be repaired with a patch clamp or epoxy sealant, while larger breaks may require replacing a section of the pipe.
If the damage is significant, it's best to call a professional plumber who can properly diagnose and fix the issue. They have the tools and expertise to ensure the repair is done correctly and safely. Regular maintenance and inspections of your home's water lines can also help prevent future issues and costly repairs.