Spacecraft Resupply Logistics: Consumables Stock Simulator

Keeping a crewed spacecraft or station supplied is a running race between consumption and delivery: oxygen, water and food drain continuously while cargo vehicles arrive only on a fixed schedule that real launches routinely slip. This simulator models that race directly — a crew of adjustable size burns through an onboard consumables stock at a combined daily rate, a cargo vehicle launches on a planned interval sized to cover the gap plus a safety margin, and a random launch delay (modelled on real ISS resupply slips) can eat into that margin. Tune crew size, consumption rate, resupply interval and safety-reserve margin and watch the instanced canister rack empty and refill in real time, with live readouts for current stock, days of reserve remaining, and the planned mass of the next shipment.