between circumferential exterior wall 2 u2205 and normal shot glass wall 34 within the chamber 42 is room for a freezable liquid such as water when filled to the fill line indicia 52 and frozen the resulting ice directly abuts the circumferential interior wall 36 of shot glass wall 34 in doing so the frozen water i e ice cools the alcohol placed inside the circumferential shot glass wall 34 fig3 shows a cap 3 u2205 having circumferential shot glass walls 34 integral with it thus the alcohol containing space 5 u2205 is part of the cap 3 u2205 the placing of cap 3 u2205 by a user over exterior walls 2 u2205 causes ice retaining chamber 42 to instantly form circumferential cap retaining wall 32 helps to hold cap 3 u2205 onto the outside of wall 2 u2205 note that exterior walls 2 u2205 can be shaped with curvature 24 so to help in supporting and maintaining the interior ice in working position the above system is generally found in the prior art and is shown in fig6 the instant invention additionally adds novel ice holding structures to the external wall 2 u2205 a first embodiment is both lip 26 and detent 4 u2205 placed upon circumferential wall 2 u2205 a second such embodiment of al ice holding structure is a circumferential detent 4 u2205 located fig2 at the bottom of the exterior wall 2 u2205 near base 22.