They claim to accomplish what you're after, but it sounds like some kind of water filtration system that they're selling. I'll link you to it just so you can have a look, but I'm not sure that's it:
http://water.computeritc.net/index-2.htmlThere are liquid mineral supplements out there. In fact, I bought a small sample of one of these a couple of months ago from VitaminShoppe. This sounds a lot more like what you're after:
Vitamin Shoppe
Trace Mineral Liquid
8 Fluid Ounces Liquid
VS-2291 #1563824
VALUE PRICE:
$14.99
http://www.vitaminshoppe.com/store/en/browse/sku_detail.jsp?id=VS-2291Directions:
As a dietary supplement, mix 1/4 to 1/2 teaspoon once or twice daily with juice or food. May also be taken straight, followed by a glass of juice or water. If needed or desired, dosages may be moderately increased. Moderately increased dosages are safe, but larger amounts may have a laxative effect. For a complete, balanced spectrum of low sodium and trace minerals, and improved flavor, add 20-40 drops (2-4 drops per glass) of Trace Mineral Liquid to one gallon of distilled, R.O., or purified water. Compares to expensive mineral water. At 20 drops per gallon, 8 ounces will remineralize 192 gallons.
Supplement Facts - Amount per Serving
Magnesium - 250 Mg
Chloride - 700 Mg
Sodium - 10 Mg
Potassium - 10 Mg
Sulfate - 55 Gm
Lithium - 1.5 Mg
Boron - 1 Mg
This didn't taste bad to me, but I mixed it in with juice not water. I only bought it so that my purchase amount was high enough to qualify for a promotional thing they were having. But it seems like a good product.
I hope this helps!!