To paraphrase Wayne, the answer is "a bunch". If you're going to go out into the field, take a bucket/pail/container that has a sealed lid (tupperware or the like works well). You can also pull the film out without breaking the chemical pack and then run them through the back when you get home.
A note about Polaroid Type 55. You pretty much need to decide ahead of time whether your going to expose for the negative or the positive. There's about 2/3 of a stop difference between the two. My experience was that a good positive required an ASA of 32, but a good negative required an ASA of 50. Find a copy of Ansel Adams' book "Polaroid Land Photography." It's out of print but still easy to find.
-Chip
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People who do stupid things with dangerous substances often die! -me
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