don't sink bring a lifejacket and you won't

As long as you use a water conditioner that treats both chlorine and chloramines there is nothing wrong with using sink or tap water in your aquarium.

Well because of density anything can sink o float it is caused by density. What i mean is if density is 1 and up it will sink but if density is 1 and down it will float .

true

It's called "pipe dope". You can get it at any home center (like Home Depot). Use plenty around the bottom of the drain where it mets the sink to prevent leaks.