Anti-coolant
You mean anti-freeze. On hot days, if you've put too much anti-freeze/distilled water in your radiator, it'll overflow and look like a leak. That's OK. If you haven't added any lately (anti-freeze or distilled water), then you might have a leak. Put a peice of cardboard under the engine (near the front) after you drive it and note exactly where the liquid is dripping. Then get under the car and look for wet spots. If it's leaking from the top of the plastic overflow container, then you're cool. If it's leaking from any hoses or where the hoses join with anything else, you have a leak. DO NOT drive much with a leaky radiator; you could overheat the car and do major damage. Seek your local mechanic if it's a leak.