My family has for as long as I can remember and We're still well and healthy. Just use common sense and use it as soon as possible and if there's the slightest hint (bad smell or taste) of spoilage, toss it. We always cover can tightly w/plastic wrap fastened with a rubber band. I would'nt keep it more than 3 or 4 days max.
no
No, room temp is fine
The reason to refrigerate urine after collecting a sample is to avoid bacteria from forming in it. If a sample of urine will be taken to a lab within an hour of collecting it, then it does not need refrigerated.
It's an open system because you take in food and water.
no
Because it can spoil or get mold.
For about a week can be more. But with all food, look at it, smell it, taste it and if it tastes ok then eat it,
You can freeze it or refrigerate it.
No, it will give you food poisening.
They will spoil. There are no preservatives in home canned preserves.
To keep germs from growing and multiplying
The link provided has the answers.
it decomposes much faster
Refrigerate it, use preservatives, safe food handling practices, pest control.
in order to extend the use of pharmaceutical product or food.
For the best taste yes refrigerate. If it is not open you do not need to refrigerate other then before you use it for best taste but once it is opened it needs to be kept in the refrigerator as indicated on the bottle
food items, vegetabls, chocolate, fruit juice, icecreams etc