AquaAlert is a two-sensor system — a smart bottle and an ankle wearable — that combines salivary conductance with whole-body bioimpedance. The fusion yields a single hydration index, updated every few minutes, with tiered alerts to user and caregiver.
The osmoreceptor response that drives thirst weakens with age. Combined with reduced renal concentrating ability and lower total body water reserves, this leaves adults over 65 uniquely vulnerable to heat. By the time confusion or syncope brings them to an emergency room, the deficit is already advanced.
Existing smart bottles count sips. Existing wearables for athletes infer hydration from sweat — a signal that fades precisely in the population at risk. Neither approach measures the body itself.
"The first measurable physiological change in mild dehydration is a rise in salivary electrolyte concentration. The first behavioural signal is fatigue. Thirst comes last."
AquaAlert moves the measurement upstream of symptoms by reading two biomarkers directly: salivary ionic conductance at the mouthpiece, and total body water through tetrapolar ankle bioimpedance. Both have prior validation against clinical reference methods.
The bottle acts as BLE hub and gateway; the ankle mesh streams to it. A multimodal model fuses the four channels into a single 0–100 score and decides whether to nudge the user, page the caregiver, or escalate further.
Conductance is sampled at the mouthpiece each time the user drinks; ankle impedance is sampled every 30 minutes; temperatures continuously. Raw ADC values are stamped and buffered on the device.
The bottle hub merges its own stream with the leg mesh over BLE GATT. No data leaves the device unless an alert is triggered.
A weighted model returns a 0–100 hydration score. The weighting was derived from the cited validation studies; it can be retrained per-user with three days of baseline measurements.
Index ≥ 60: silent. 30–59: gentle prompt to drink, with the bottle's haptic vibration. < 30: caregiver notification and, if configured, a call to emergency contact.
The hydration-monitoring market is growing, but the products are designed for athletes and industrial workers. None target the elderly. None are designed for institutional procurement. The market gap is not technological — it is one of attention.
| Product | Target user | Body-state sensing | Caregiver alerts | Reusable | Institutional channel |
|---|---|---|---|---|---|
| AquaAlert | Adults 65+ | Saliva + BIA | Yes | Yes | Designed for it |
| Nix Biosensors | Endurance athletes | Sweat | No | Single-use patch | No |
| hDrop | Endurance athletes | Sweat | No | Yes | No |
| Epicore Biosystems | Industrial workers | Sweat | No | Single-use patch | B2B industrial only |
| Kenzen | Industrial workers | HR + skin temp | No | Yes | B2B industrial only |
The natural buyers are not individuals but institutions: regional health departments running summer heat-wave plans, residential care providers managing duty-of-care obligations, and mutuas integrating prevention into their service offering. Each has the budget, the mandate, and the distribution.
No sign-up. No installation. The same interface the family would see on a phone, and the same caregiver console a residencia nurse would use.
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