I love the Grey Poupon mustard comes in a squeeze bottle for use at barbecues.  Of course, squeeze bottles are also great for kids, provided in this case that they like the more sophisticated, sharp flavor of Dijon mustard.  Before I found this squeeze bottle, I was using Guilden's, and this mustard is much closer to what I use normally on sandwiches.  The ingredients are simple:  water, vinegar, mustard seed salt, white wine, fruit pectin, citric acid, tartaric acid, sugar, spice.  The flavor is wonderful.