Hey everyone, thank you for your suggestions! The problem that was killing the battery was the voltage regulator on the alternator. I found this by hooking up my multimeter to the battery terminals when the car was running. It was reading something like 14.699 volts. I replaced the voltage regulator and the battery has not died since.
However now I have a new problem. The coolant temperature gauge light is flashing slowly, which makes sense because the engine compartment purge fan runs at 100% from the moment I turn the key, until a few minutes after the key is taken out. Also the CEL is still half lit. I bought an ebay engine compartment fan and swapped it out, but the same two issues appear.
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