In general the more complex a virus is, the less it can survive outside the body for transmission
That’s why you don’t get a virus that spreads like the common cold but is extremely fatal. It’s a balance of nature, based on physics
Blood borne viruses tend to be complex which is why they are delicate and most commonly spread through things like sharing needles, child birth, and blood transfusions, etc
While it’s theoretically possible for a virus to float through the water from one person to another, or probably even in the air for that matter (standing in the wind etc), practically speaking it’s not going to happen. Even if it did, a single infected copy of the virus is not going to infect someone (again practically not theoretically speaking) because it would have a treacherous journey ahead of it to make it that far even after it got into a body
Otherwise everyone would be dead
This is not directed at you personally, but I think Hollywood contagion movies planted a lot of ideas in the public psyche which is partly why people thought their was a global airborne pandemic that would kill a large percentage of people recently. The more complex a virus is the less transmissible it is in general