You want to minimize the potassium, not try to eliminate it completely. It's impossible to cut it out completely.
I say that in an earlier post, but I didn't include the warning alongside the Oral Rehydration Therapy link. I'll update that post.
Nevermind. Can't update it now that someone's replied to it.
But go light on the potassium and heavy on the sodium. Perhaps even just omit the potassium since you're probably getting more than enough from other dietary sources.