**1. The Essentials** – Plain and recognisable. Conveys universality without jargon.
**2. The Commons** – Historically resonant; implies shared stewardship and access.
**3. The Necessaries** – Older English form; concise and weighty, suits legal or philosophical use.
**4. The Foundations** – Implies structural indispensability, not mere convenience.
**5. The Non-Optionals** – Retains your framing; clear, modern, slightly ironic in tone.
**6. The Basics** – Conversational, familiar, conveys irreducibility though less formal.
**7. The Infrastructure of Being** – Evokes depth and interdependence while keeping the philosophical frame.
If brevity and clarity are paramount, **“The Commons”** or **“The Essentials”** communicate the idea best; **“The Non-Optionals”** keeps your coinage distinct and memorable.