The only drill I can really think of is to set your ideal walking path on the lanes with some painters tape (would not recommend the slide step) and then video record you bowling. This way you could potentially identify at what point you are experiencing the drift and maybe could identify what needs to be remedied. The concern I have with this method is if you don't know how to identify or correct what is causing this issue you may do more damage than harm by yourself (you may notice that your third step is out of line, but if you don't know why you are getting off line and/or how to fix that problem you may create a bad habit/issue trying to force your feet in the positions you want). Remember that your footwork is very much a foundational part of your game and can cause significant chain reactions, positive and negative, when adjusting.
I think the bigger part of this is managing the amount you drift; consistency is key and if you drift the same amount each time at least you would know where you are ending up and can line up off of that drift.
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