Not only does citrus water help give you a little kick in your step, but it will likely entice you to hydrate more throughout the day. (mindbodygreen.com)
We like to add some smoky chipotle chili powder to ours, which gives them a little kick, but this is completely optional. (backporchpaleo.com)
A pinch of red pepper flakes gives it a little kick. (motherthyme.com)