This supercharger coolant tank holds about 2 quarts. Small, but stock setup. Together, the tank and cap were 150 bucks or so... Vibrant silicone coolant hoses as well for 25 bucks per 5' and is great quality.
Another tip. GET LSA VALVE COVERS. OE valve cover / coil brackets did not work in my case, the wiring harness bunches up with the injectors, coil bracket and coil harness. Got these LSA covers complete, minus the oil filler neck, for 200 bucks. they were new take-offs allegedly, but they looked the part. You can see the valve covers here, much cleaner.