| HI,
First thing about picnics; buy yourself a cooler, one large enough to put sandwiches in, with drinks, as suggested by your first answer.
I wouldn't trust any meat sandwiches to stay "good" for more than a couple of hours without being on ice.
Of course, you could always take some kind of canned foods, open them while you are there; like pork n beans, potato chips, canned spam, make sandwiches with them there; be sure to take a loaf of bread.
Just some thoughts. Have fun. | 
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