Directions Directions for Use: Use only plain tap water in the bottle. Using anything other than plain tap water could destroy or damage the bottle. Let out excess air before placing stopper into threaded opening. Turn stopper so it fits securely into threads and tighten. Test for leakage by turning bottle upside down and pressing down on bottle firmly. For Warm Application - Fill bottle 3/4 full with tap water only (Caution: Tap water can cause burns). For Cold Application - Fill bottle 3/4 full with cold water or crushed ice.After Use and Storage: Before storage, rinse bottle thoroughly with luke warm water Hang open bottle upside down to drain and air-dry. Store bottle flat in dark, cool, dry place. Do not place heavy or sharp objects on top of bottle.