This may sound a bit strange question, but I am very new to biology. I would like to ask that do microorganisms like viruses, bacteria, amoebas, etc also contain water, as every living thing contains water?
The short answer, is yes, pretty much!
Do microorganisms contain water?*
Bacteria and eukaryotic microorganism
Bacteria and eukaryotic microorganisms (including amoebas) have a membrane that separates the interior from the exterior. And yes, they have water inside, in which all chemical reactions take place.
Viruses, on the other hand, do not really have a membrane that separates the interior from the exterior. They are really just a bunch of proteins stuck together. As such, it is hard to tell whether you would consider the water in which those proteins float part of the organism or not.
Note however, that some viruses have a viral envelope (that can be derived from a host cell membrane). In such viruses, there is more clearly an interior and an exterior, and yes, there is water in the interior too! However, there is (except very few exceptions) no metabolism inside this envelope. This, by the way, is part of the reason viruses are not considered alive.
Dehydrated living things
Note that some organisms can survive with very little water. Some seeds can survive extremely strong dehydration. For example, some tardigrades can survive with less than 1% water in their body (see this New York Times article).