well most people would say EW DRINKING YOU'RE URINE?
BUT, drinking urine has been found to have many medical benefits. First, if you are that fish man from water world, it should be just fine. Because you need to keep your osmolariity higher than your surrounding environment .
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It is possible to get sick from drinking another person's drink if the person is carrying something contagious. That's not to say "you will get sick", just "you may..." If they are infectious, it would still have to be a pathogen communicable via saliva or a pathogen which is able to survive for at least a short time-period on surfaces for you to have a risk of catching it.
For example, if the person who's drink it is has a cold sore (herpes labialis) and you drink from the same side of the glass/mug that they have drunk from, you do run the risk of getting a cold sore yourself. If the person has a sore throat, there seems to be a reasonable risk you could catch it from them.
However you cannot catch a cold or 'flu from sharing somebody's drink, because colds and 'flu are gained from touching a surface which as the virus on it, and then accidentally transferring it to your mucus membranes (e.g picking your nose or putting your fingers in your mouth). Hence why handwashing is really important in 'flu season.
Meningococcal meningitis is transferable via saliva (e.g drinking from the same side of the glass). Although this is an uncommon disease it is very unpleasant, so sharing drinks with anyone who has meningococcal meningitis would be best avoided.
You could get measles through sharing the drink of someone with measles.
You would be unlucky to get hepatitis A through sharing a drink with someone with hep A, but it is theoretically possible. You would not get hepatitis B through sharing a drink with someone with hep B. You would not get hepatitis C through sharing a drink with someone with hep C.
It is not possible to get HIV through sharing a drink with someone who has HIV.
These are just a few examples, clearly there are many more diseases which are communicable through sharing drinks. To be honest, if you wish to share drinks your best bet is only sharing drinks with people who you've known for a long time, and who do not appear to be actively ill at that moment in time. The same principles apply to eating chips'n' dips when people are "double-dipping" (dipping and then re-dipping the same end which they've had in their mouth).
The risk of you catching something from drink sharing increases if you are immunosuppressed.
It is safe. But it probably doesn't taste good. I won't try it but you can for me.
i saved up my iguanas urine for a week and drank it all in one sitting. i proceeded to vomit.