Any Low/no silicate EG antifreeze conforming to GMXXX is fine.
Distilled water is ok at best since there are still silicates, phospates and many other things in distilled water. Never mind that all distilled water is not equal.
I have used Distilled water in the past but switching to RO/DI water. It is the best of the best of the best!!!! /forums/images/graemlins/grin.gif
I als use Fleetrite antifreeze but they are also many other good ones out there.