Fluids entering the blood stream should be isotonic (same salt concentration) as the blood. Water is hypotonic to the cell environment (contains fewer solutes) and this would result in a net movement of water into the cell, causing the cell to swell and lyse (burst).
They would change in volume.
blood cells die
If you put the blood cells in very salty water the molecules would go from a higher concentration to a lower. In conclusion the blood cells would shrink.
It can cause Anemia.
Distilled water would have a higher concentration of water molecules compared to red blood cells. Red blood cells have solutes dissolved in them, so they have a lower concentration of water molecules relative to distilled water. This concentration gradient would result in osmosis moving water into the red blood cells to equalize the concentrations.
All the water would flow toward the inside of the blood cells by osmosis, and they'd swell way up. Maybe even burst.
When ion content is wrong, it can cause the wrong amount of water to be drawn unto cells by osmosis, so the cells are damaged
Your question is confusing, did you mean "distilled" water? Your body & cells live and function not in a pure water environment, but water with several electrolytes in specific concentrations: sodium, potassium, calcium, chloride and several others. If you placed red blood cells into pure water (distilled water) that did not have any of the electrolytes mentioned above, the distilled water would enter the blood cells through the process of osmosis. The basic idea of osmosis is that if there is a chemical gradient and a permeable membrane separating this gradient, there will be a transfer of water trying to reach an equillibrium. The solution in your red blood cells would be hyperosmotic compared to the distilled water. The cell membranes are semi-permeable, and would allow some of the distilled water to enter the cell, trying to balance the osmolarity. The effect would be that the red blood cells would swell with distilled water and likely burst--like an over-filled water balloon. If enough red blood cells were to pop, they could release enough electrolytes into the distilled water to keep other red blood cells from swelling and popping.
it would shrivel up
because red blood cells are blood and if they can disolve there for they will burt cause the blood has acid in it.
You would have pernicious anemia, causing joint pain, inflammation, and need medical care to build up your red blood cells again. Further degeneration of the red blood cells would be called leukemia, a cancer of the blood!
It would die.