In an era where technological advancement intersects with a growing need for sustainable living, the concept of offering basic food for free seems not just utopian but increasingly feasible. The key lies in harmonizing three pivotal elements: automated indoor farming, renewable energy, and rainwater capture.

Automated indoor farming represents a leap in agricultural efficiency. By moving farms indoors, we mitigate many of the uncertainties and inefficiencies of traditional farming. Controlled environments allow for year-round cultivation, unaffected by external weather conditions. Moreover, automation in planting, monitoring, and harvesting reduces labor costs and human error, leading to higher yields and consistency in produce quality.

Renewable energy is the second pillar in this equation. Solar panels, wind turbines, and other green energy sources can power these automated farms, slashing the carbon footprint and operational costs. This symbiosis between agriculture and clean energy not only promotes environmental stewardship but also ensures long-term sustainability and economic viability.

Finally, integrating rainwater capture systems addresses a critical aspect of farming: water supply. In indoor farming setups, rainwater can be collected, purified, and reused, significantly reducing water waste. This system not only ensures a reliable water source but also lessens the burden on local water infrastructures.

The integration of these three components – automated indoor farming, renewable energy, and rainwater capture – paves the way for a future where basic food can be offered for free. By drastically reducing costs and environmental impacts, this model could revolutionize our approach to food security and sustainability. It's a vision where nourishment becomes a right, not a commodity, aligning with the broader goals of a more equitable and sustainable world.

This concept, while ambitious, is not beyond our reach. With continued technological advancements and a collective commitment to sustainability, the dream of free, basic sustenance could very well become a reality in the not-so-distant future.