For those who take, or give to your kids, the Natural Vitality magnesium or the cal/mag, do you dissolve it in hot water? That's what the bottle says, and I am assuming that is just to get it to dissolve completely. But that seems like so much extra work, and then I have to let it cool down, etc, it is just faster to stir it around quickly and drink it down right away. There's a little residual left in the glass, but I feel like we're getting most of it. Is that fine, or is there something about drinking it in warm liquid that makes it more absorbable?