Spitting out water/milk

Me

Hoping someone else is dealing with this and it’s just a phase because I’m going crazzzzyyy. Is anyone else’s LO filling their mouth with either water or milk and then opening it and just letting it run out of their mouth? Or is it just my little weirdo?

I feel bad taking his cup away but I’m also so over cleaning up milk and water 10000 times a day and changing his shirt. Any tips for this?? TIA from one mama that has enough laundry to do🙃