According to the general consensus on Reddit travel communities, you can bring ice through TSA as long as it is completely frozen when it reaches the security checkpoint. The "Reddit trick" often shared involves filling a reusable insulated bottle (like a Yeti or Hydro Flask) with ice cubes and drinking any melted liquid before entering the screening line. TSA’s official policy mirrors this user advice: if ice is solid, it is treated as a solid; if it has melted into a liquid, it must adhere to the 3-1-1 rule (3.4 ounces or less). Travelers on Reddit recommend using high-quality insulated containers to ensure the ice doesn't melt during a long commute to the airport. However, users also warn that a "difficult" agent might still ask you to dump it if they see even a small amount of water at the bottom. To be safe, many seasoned travelers suggest filling your bottle with ice, clearing security, and then refilling with water at a fountain or a Starbucks inside the terminal.