Does the ruling of pure water cease to apply to a small amount of water (less than two qullahs) if an insect, such as a cockroach, falls into it, rendering it unfit for drinking or ablution?

The falling of insects that do not possess flowing blood, such as cockroaches, into water or other liquids does not render it impure according to the majority of scholars, and it remains permissible for use. This ruling extends to all creatures that do not have flowing blood, such as bees and spiders. Some scholars have made an exception for insects generated from impurities, such as privy cockroaches. However, according to the view that impurity becomes pure through transformation (istihalah), privy cockroaches are pure. In conclusion, insects that do not have blood are pure and do not render impure whatever they fall into.