Is it permissible to perform ablution (wudu') with water into which a small reptile has fallen and caused a foul odor, and is it obligatory to repeat the prayers performed with that ablution?

If water changes due to an animal falling into it, purification with it is not valid. If the animal has flowing blood, the water is impure (najis). If it does not have flowing blood, then the water has changed due to mixing with a pure substance that is not essential to it, which prevents the validity of purification with it according to the majority of scholars. Based on this, whoever performed ablution (wudu') with this water must repeat all prayers performed with it.