When I lived in Germany I used to put 2 5-liter kegs in my check-in baggage all the time. Never had a dropped spilled or a can dented. I just wrapped them up in jeans.
For bottles I'd probably bubble wrap and wrap in jeans.
I would place them near the top and bottom of the suitcase as these are the more sturdier portion of the case. If you put them near the middle that are has more "give room" and is crushable by other baggage...just a thought.