Dice: If you don't have Fudge Dice, you can instead use 2d6, each of them a different color, such as white die (positive) and a red die (negative). One die represents pluses, the other minuses. Subtract the positive die from the negative die to get a result. For example, if the positive die reads 4 and the negative die reads 3, the result is +1. If the positive die reads 2 and the negative die reads 6, the result is -4. If both dice show the same number, the result is 0.
This does allow +5 and -5 results, which 4dF does not, and it has more variation in results (although a sharper curve) as you are rolling only 2 dice instead of 4, but it may be faster and easier to use than trying to figure out the result of 4d6 that are not marked as Fudge dice.
Alternatively, you might find it easier to roll d100 (ie, 2d10), and consult the following chart (which replicate fudge dice exactly).
Or flip four coins, treating heads as 1 and tails as -1, which has a simpler, but similar probability curve.