Spill-Proof Cap Combo 4-Pack
For juice bottles and sports drinks (which have wide openings), just screw on a red spout
For water bottles (which have narrower openings), place an adaptor ring onto the bottle neck before screwing on the spout. The blue adaptor ring fits coarse-thread bottles; the yellow adaptor ring fits fine-threaded gbottles. (No engineering degree needed...you'll know at a glance which fits which!)
Top-rack dishwasher safe