Just wanted to share this an approach I've recently taken in regards to water filtration... kinda like sawyer squeeze.
SOFTBOTTLE™ .5L | 1.0L x2 = 2.4oz (remove base caps, replace with push-pull cap)
PUSH-PULL CAP x2 = .4oz (zero out due to replacing base caps)
GRAVITYWORKS™ REPLACEMENT FILTER...