Assalamu alaikum .. You said, 1 Mudd = 250 ml.. What I saw in many places, it's approximately 500 ml or 750 ml.. And it seems quite difficult/impossible to make wudu with 250 ml..😁
If I've ever said 250 I was wrong for sure. It's about 1.3 pounds of water, which is between 575 and 625 ml of water.