This isn't really the right forum, though I guess it is performance enhancement lol. However, simply you can crush up a few of your tablets of vardenafil into a powder and just add water (tap is fine) to make a suspension (mixture). You'll make a lot of work for yourself if you want to remove excipients like hydroxypropyl cellulose that won't dissolve.
For example, let's say each levitra tablet is 10mg.
If you crush up 10 tablets and slowly add water until the total volume reaches 10mls, you will know that each 1ml on your measuring dropper = 10mg vardenafil.
Thus 0.5ml = 5mg, and so on.
Because it's only a suspension, you'll need to shake the vial well every time you dose. Keep the vial in the fridge and if you're worried about the lack of preservatives add some everclear/vodka/rum etc when adding in the water.