In large skillet, combine water, vinegar and salt. Bring water to boiling; reduce heat to simmer (bubbles should begin to break the surface of the water). Break one of the eggs into a 1-cup measuring cup with a handle. Holding the lip of the cup as close to the water as possible, carefully slide egg into simmering water, taking care to not break the egg. Repeat with remaining eggs, allowing each egg an equal amount of space.