I don't know why a water bottle label would be risky near a fire? They would just melt if they were put in a fire I am pretty sure. Don't put the bottle near the fire.
scoop some water in bottle and heat it up on a fire
Because the temperature of water can't normally go beyond 100 degree Celsius , because that is the temperature of boiling water. When we keep any bottle with water on fire, heat transmits from bottle to water and since the temperature of bottle and water should be almost same, the temperature of bottle does not go far beyond 100 degree Celsius. And since the melting point of the bottle(plastic) are in general above 100 degree Celcius they don't melt.
First Aid kit, water, food, water bottle, pocketknife, fire starter, map and compass
Usually an army water bottle with metal cup, a fire steel and knife.
In the first place the water in the bottle would keep the temperature of the plastic down preventing it from burning and leaking, The same as you would do by boiling water over a flame in a paper cup, However the water in the bottle would heat up and eventually the pressure inside the bottle would burst it like a balloon.
If the bottle is left in a place where the sun can shine through it, the bottle can magnify the heat from the sun and start a fire.
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Fire labels for furniture were introduced in the United Kingdom with the Furniture and Furnishings (Fire) (Safety) Regulations in 1988. These regulations aimed to improve fire safety standards for upholstered furniture and furnishings by requiring them to meet specific fire resistance criteria. The introduction of these labels helped consumers identify products that complied with safety standards, thereby reducing the risk of fire-related incidents.
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To safely and effectively cut a bottle using fire, you can heat a piece of string or wire wrapped around the bottle at the desired cutting point. Once the string is heated, quickly submerge the bottle in cold water. The sudden change in temperature will cause the bottle to break along the heated line. Remember to wear protective gear and handle the hot bottle carefully to avoid injury.
Put the empty bottle near a fire.