As we edge ever closer to the final bank holiday of the year, thoughts will turn of how to spend that precious day off from work and school. A day at the beach, a trip to a theme park or just an afternoon spent in playing in your local park will all be an option, and one way of saving money is by taking a picnic lunch and your own drinks. But, it has to be said that this is not always the most attractive option, especially if our day out involves a long car journey. Droopy, limp salad, hot sandwiches filled with melted cheese and butter, and warm soft…