The best way is don't because the domain owner is likely to demand a retarded price now that s/he knows someone is interested in it. They are hoping for an outrageous bid from a large corporation or government institution. IME, they are just not worth the trouble from a bidders perspective.

Many squatters register domains when registrars offer have specials like "50 domains for $10!" Those domains never gets renewed by the squatter and instead they are just hoping for one profitable sale. So it's entirely possible that the domain you're interested in will expire naturally and then you can pick it up.

Also, don't visit the squatters domain in a browser. The blank page is there to measure how many hits the domain gets to estimate popularity and therefore also value.