As far as I know there are no SN pills, because it´s not a medication. But what you could theoretically do is to fill the SN into capsules. But in that case, you would have to drink much more water to swallow all the capsules than the amount of water recommended to dissolve the SN.
Other portable things are: tourniquet, BBQ, medications you need for the Amitriptyline method and Chloroquine method.
You can find guides in this thread:
whats the best kind of method that's easily accessible. I was considering Hannah Baker style but that seems super messy and painful. I don't have any way to get my hands on N or anything like that sooo
sanctioned-suicide.net
This is just a general information. I do not encourage you to commit suicide and to use these methods. You act on your own responsibility.