The water inside a cell is capable of transporting nutrients throughout the cell because

It's capable of transporting nutrients throughout the cell because it's fluid so it's much easier for the nutrients to get around and get where it needs to be.
if it were a solid, it wouldn't have a lot of room and the nutrients wouldn't be able to get around because the molecules are tighter in a solid and the molecules in a liquid are much more loose!
i hope this helps!