Rapidly consuming a bunch of fluids will raise your blood pressure transiently. True. But not a clinical problem; the only time this will cause issues is if a patients gets intravenous fluids rather quickly, usually several liters too much in a short time frame, in which case they can have hypertension but more importantly face fluid collecting in their lungs, giving them “congestive heart failure,” or something similar to starting to drown.
As for thinning, eh, no, that’s not a thing. Clotting and viscosity are quite different. The viscosity of blood from a patient who is normal and another one on a potent blood thinner will be THE SAME. The difference is that when the blood of the first patient is exposed to damaged tissues / bleeds, it clots normal (soluble fibrinogen is converted to nets of fibrin, making it solidify into a clot). The patent on the blood thinner doesn’t do that as well.
When you drink a lot, you’re not going to increase your blood volume that much. As soon as the water you drank started getting absorbed, your body would sense it, and start excreting dilute urine to keep your salt concentrations ok. Drink too fast, and before your blood is diluted to any real extent, you’ll have brain swelling, seizures, coma and death because you screwed up your sodium level.
Even if you could drink enough to dilute your clotting factors by a lot and your liver failed to make extra to keep up, this won’t affect your clotting at all! You have a lot of redundant clotting capacity. People with hemophilia (clotting factor deficiencies) usually only experience bleeding when the deficiency is profound, like less than 10% normal. And again, to drink your blood that dilute, you would have killed yourself several times over already.
I hope that helps… blood “thinning” is really a metaphor for what anticoagulants do. Clotting happens because of a complex system of proteins that work to solidify blood at sites of bleeding, not in relation to red cell number. So water doesn’t thin your blood, it doesn’t prevent clots, and you can’t make much of a dent in your red cell concentration without drinking anyway, unless you kill yourself by lowering your salt concentration too much too fast (don’t do that).
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