A Halachic picnic with cousin Vinny

Tonight was supposed to feature a guest post, but unfortunately it has yet to materialize, so before it gets too late I'll just do it myself. If I fail the test because of this..

So you're not allowed to place a salt container next to a container of kutach because we're afraid that the kutach will splash into the salt and then you'll put that salt into meat. Since the kutach is not batul you have therefore committed a great sin and will undoubtedly burn for an extended period of time in the eternal barbecue that is New Haven, CT. Oh, sorry, I meant hell. Same difference.
You are allowed to put a container of vinegar next to kutach though, because even if the kutach splashes over it'll be batul. Obviously this is only b'dieved, not l'chatchilah.
So let's say you want to eat salami sandwiches on your picnic, but cousin Vinny is a vegetarian and insists on dainty mustard and watercress delights for his lunch? And let's say there's no watercress in the house, so he has to settle for some cheddar. So do you have to beat up cousin Vinny, or can you compromise and both eat on the picnic? Did I mention that for various involved reasons, Vinny can't carry a backpack, so you'll have to carry all the supplies? Not that it matters anyway, because all you have is an ancient lunch pail. At least you have separate containers for the sandwiches. Because as you may have guessed, there's no problem with taking these two delicious victuals along with you. Why is the law this way? After all, in the precious case, you had something which could possibly be mixed with meat, and is therefore forbidden, while here you have meat and milk together, in perfect harmony, and no one seems to mind! In fact, that's exactly why it's allowed. Because we trust you to mind the foodstuffs and make sure that they don't mix, because while a person might not be too careful when it comes to mere possibilitys, he sure is scrupulous when it comes to close cases like this. A bit ironic, isn't it, that you're allowed to do something that has a greater chance of going wrong than something which doesn't?
There is still one concern of course, and that is whether you're allowed to share that mustard you thoughtfully provided for Vinny's cheddar. See, you take one bite out of that salami sandwich, and you realize that what it dealt needs, besides to be washed down with Coca-Cola Classic, is some mustard. Good thing that at this juncture cousin Vinny is able to call some of his mafioso friends and arrange for a single bottle of Coke to be brought to the picnic. So can you share the Coke? Was Vinny classy enough to have his friends provide two cups, or are the two of you stuck, one with his mustard and one with his Coke? A tragic ending indeed.

But indeed, hope lurks in the hearts of man, and not only do you discover two cups growing in the bushes, but Vinny remembers that when he was making his original sandwhich he had mustard'ed it before realizing that there was no watercress in the house. The result? Felicitous bliss. How cute.