That drinking while eating is somehow unhealthy has got to be one of the oldest and most commonly propagated health myths around. The rationale most often used is that drinking with meals dilutes digestive juices. That's simply not so.
Water can flow in and out of the stomach while it retains food and digestive enzymes.
In my view drinking with meals is purely a matter of personal taste. I know of no valid health reasons why you should abstain. I drink much of my water with my meals and animals often drink with theirs. In fact, I'd venture to recommend that you make a point of drinking with your meals, as most people don't drink enough water throughout the day and meals may be the only time you can focus on replenishing your body's fluids. The body uses water in digestion, absorption, circulation, excretion and other vital functions and needs to replace it.