cant really mask the taste. youll get used to it.
the more water/liquid you use, the more diluted the taste becomes.
you can also use crystal light, sugar free kool aid, sugar free tang, etc.
i just mix my BCAA/cee/taurine/etc cocktail with enough water so everything (kind of) dissolves, then i take a "shot" of it. It tastes horrible but goes down quick. Now im used to it and it doesnt bother me.