I took vodka in a Diet tonic bottle but make sure you reseal the top with glue. By the time we got to Hilo, I took an empty diet tonic bottle of the ship and bought more diet tonic and another bottle of vodka. Before we went back to the ship I filled that empty with vodka and resealed it. I also carried my real diet tonic in a bag and when I order vodka and I asked for ice and large glass and then took out my diet tonic and filled.