I use Nestle's Everyday Whitener to make coffee. But with some brands of coffee (eg: Davidoff) the creamer doesn't seem to dissolve. It instead remains suspended as granules in the coffee. But with other Nescafe brands of coffee the dissolution occurs easily. What's the difference and how do I fix it? 
I have noticed that my non-dairy creamer dissolves just fine, unless... I dissolve the saccharin-based sweetener first.  If I put the saccharin-based sweetener in first, the non-dairy creamer makes lots of clumps and doesn't dissolve properly. 