[mbrock]

Download a pleasant language distribution with a capable base library and documentation, like Racket.

You might not need to do everything in the fastest or most scalable way. Like how a writer in a cabin will produce something that later needs editing and typesetting for mass distribution. So, like, if you forgot how to use an SQL database or didn’t bring Postgres, just serialize a big hash table and do your queries in your programming language.

So you can build the program out of parts that you might need to replace once you’re back online.

You can also do a lot of work with a specification language like TLA+ where you don’t need to actually implement every algorithm. If you need a hash function you can just postulate a function from your domain type to the naturals.