Okay, I got it to kind of work using this:
[pass global=query fields=s]
<h1>Search Results for: {S}</h1>
[loop type=post]
[if field=title,content contains='{S}']
<div>
<h2>[field title]</h2>
<div>[field content]</div>
</div>
[/if]
[/loop]
[/pass]
It’s not a perfect replication of an actual WordPress search, but it’s good enough for me. Thanks!