Sorry Fairflight, beg to differ.

Distilled water is perfectly safe and will not leech minerals from the human cell....Only those expelled by the cell in the first place as toxic are removed. Minerals in water generally have a difficult time being absorbed by the body, even from spring water. Pure Water is best for removing toxins and maintaining an alkaline PH. Water with minerals is generally more acidic. Our minerals absorbed by the body generally come from the food we eat.

[link to www.energiseforlife.com]

I include two silver coins in my collector for the purposes of ionization. My only thoughts with Corexit is that it may contain volatile substances, however, these should have already evaporated so distillation is the go.That way All solids in the water are eliminated.
Only thought regarding reverse osmosis is that it "kills" water and you have to put life back into it somehow.