Yes but It depends on what country you live in and how clean the water is. But it should be safe to give it to your cat.
Yes you do, is this even a legitimate question... Think about it, do you need water to live... Okay, let that sink in.
SiNk
HOT rises COLD sinks
Most tap water (unless labeled differently) is ok to drink. If you mean water in the sink, the sink must be clean, too, and the water free of contaminants.
It should be thawed in a fridge, but if you are in a hurry, then put it in a sink filled with cold water. This is faster than no water and safer.
An egg will sink in water but will float in salt water. An egg will sink faster in hot water than it will in cold water.
It sinks faster in hot water than warm or cold
The cold water faucet in the kitchen is typically located on the right side of the sink.
Cold water is more dense than warm water so the cold water has to sink to the bottom which causes a density current.
When cold water is poured into hot water, it sinks because it is denser than the hot water. The cold water is heavier due to the molecules being closer together at a lower temperature, causing it to sink to the bottom. The hot water, which is less dense, rises to the top.
cold water is denser than hot water. The same is true of most other substances as well.
Cold will sink to the bottom. Hot water will rise to the top.