Has anyone had any experience pre-mixing Infinit powder with water and letting it sit for a while - many hours?

I'm hoping I can premix enough for 24 hours without it getting skunky. Anyone who's had Perpetuem that's been sitting around for more than 2 hours knows what I mean by "skunky"! Hammer (Perpetuem) and Infinit use different types of protein, and the nice folks at Infinit say it's okay, but I would love some first-hand experience with this.

I'll try to keep it chilled, but not really sure that's gonna be possible. So, can I premix it in my water bottles for 24 hours?