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I understand your concern. When it comes to potential risks associated with plastic bottles, it's essential to consider the frequency of exposure, as more prolonged and repeated exposure could potentially increase any risk associated with the material.

While there may not be a single specific formula to quantify this risk, a common approach to evaluating potential risks is to consider the following factors:

Duration of Exposure: The longer the exposure to the plastic material, the higher the potential risk of chemical leaching or degradation. For occasional use, the risk may be relatively low compared to daily, prolonged exposure.
Temperature and Conditions: High temperatures, especially above room temperature, can accelerate the leaching of chemicals from plastic. Avoid leaving the plastic bottle in hot environments, as this can increase potential risks.
Type of Plastic: Different types of plastics have varying levels of risk associated with them. As mentioned earlier, PET plastic (code 1) is generally considered safe for single-use and repeated use with food items. However, other types of plastics, especially those with recycling codes 3 (polyvinyl chloride or PVC) and 7 (other) may have higher risks due to potential leaching of harmful chemicals.
Individual Sensitivity: People's sensitivity to certain chemicals can vary, so what might be safe for most people may have adverse effects on individuals with specific sensitivities.
While there may not be a straightforward formula, it's important to use common sense and best practices for safe use and care of plastic bottles:

If you're concerned about potential risks, opt for high-quality bottles made from food-grade materials like PET.
Avoid leaving plastic bottles in hot environments or direct sunlight for extended periods.
Regularly clean and inspect the bottles for signs of wear or damage.
Consider alternatives, such as stainless steel or glass bottles, which are generally more durable and have a lower risk of chemical leaching.
In summary, while daily exposure may potentially carry more risk than occasional use, the risk associated with PET plastic bottles is generally considered low when used appropriately and maintained properly. If you have specific health concerns or sensitivities, it's always best to consult with a healthcare professional for personalized advice.