Oh, I see what you mean now.
Yeah, he could have, but there are some difficulties.
First, the gas would have to be inhaled by Crazy 8 for an extended period, so as you say, Walt would have to hold it under his head. He's still in close proximity.
Second, one of the reasons they used the RV was because of the smell and other "meth lab here!" giveaways. Brewing and using the gas in Jesse's house would defeat the purpose and possibly alert neighbours. (I know they cook in Jesse's house later, but it's a factor).
Third, gas expands until its molecules fill the available environment. He'd have to either seal Crazy 8 into a small chamber or make a tonne of the gas.
Fourth, I'm not sure about this, but it looked to me like the gas was a quick reaction. Walt can't just brew it and bottle it, he'd have to blast it at Crazy 8. But Crazy 8 knows what's coming now and is bound to hold his breath for that initial burst. Again, Walt needs a LOT of the gas this time, or he needs to pump it into a small chamber containing Crazy 8, and he needs to set up some lab equipment to do this.
Frankly, I think the bag was the best option. It's quiet and leaves no blood. It does require physical effort for an extended period. If that was a problem, the knife would be the way to go.
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