Most people just use some good tape to seal up the flap and zippers. Like that Foil tape that they use on duct work, not actually duct tape. Here's the deal on whether the CO is going to be able to pass through the fabric: I'm sure some will. It's a gas after all. You can go to additional trouble and line the entire inside of the tent with something else, like some kind of foil substrate, or maybe even plastic bags. Anything would help slow the amount of CO that escapes. I'm not sure if it's necessary, though. If you generate enough CO at a fast enough rate, I don't think you need to do all that. However, yes a meter is some money, but well worth it. You need to be 100% certain that what you are doing, i.e. you have the tent sealed well enough, you have enough charcoal generating enough CO, at a fast enough rate, to a high enough concentration, etc. What good would it be to only find out that you didn't get quite poisoned enough to kill you, but only enough to lose consciousness and suffer irreparable harm? You really need to do some trial runs, take measurements, get your ducks all in a row, so to speak, so that when you are ready, you can be certain of success. You need the meter. Look at it this way. It's way cheaper than buying N. The other thing is that you can use too little charcoal, but you can never use too much.
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