Yes, you can re-use the First Juice sippy-top bottle, so long as it is thoroughly cleaned, as you would any other sippy cups you own.

Cleaning Directions:

We recommend washing each piece after each use, with warm water and mild liquid soap, scrubbing each section of the cap and bottle, and then rinsing thoroughly. The cap and bottle are also top-rack dishwasher-safe, but then will wear out over time. Due to high temperatures, spill-proof performance may be reduced if pieces are cleaned in dishwasher multiple times. We do not guarantee or replace any caps or bottles that naturally wear out over time. We do not recommend boiling the cap.

Warning:

Never leave child unattended with this or any other toddler product.