A bite-actuated mouthpiece , comprising: a body , comprising: a dispensing wall , wherein the dispensing wall comprises a self-sealing exit , one or more sidewalls extending from the dispensing wall , wherein the one or more sidewalls and the dispensing wall define an internal volume , and further wherein the one or more sidewalls comprise opposing bite regions ; and an inlet to the internal volume ; wherein the self-sealing exit is selectively configured to transition between a closed configuration, in which the self-sealing exit is closed and drink liquid in the internal volume may not be dispensed through the self-sealing exit , and an open configuration, in which the self-sealing exit is open and drink liquid in the internal volume may be dispensed through the self-sealing exit ; wherein the self-sealing exit is biased toward the closed configuration and is configured to be selectively reconfigured from the closed configuration to the open configuration responsive to user-applied compressive forces to the opposing bite regions ; wherein the bite-actuated mouthpiece has a longitudinal axis that extends through the inlet , the internal volume , and the self-sealing exit ; wherein the dispensing wall has a dispensing-wall thickness that increases toward the longitudinal axis relative to the one or more sidewalls ; wherein the dispensing wall comprises an interior surface that faces the internal volume and comprises a pair of elongate projections that extend from the interior surface ; and wherein the interior surface of the dispensing wall meets the one or more side walls at an acute angle of at least 45°. a body , comprising: a dispensing wall , wherein the dispensing wall comprises a self-sealing exit , one or more sidewalls extending from the dispensing wall , wherein the one or more sidewalls and the dispensing wall define an internal volume , and further wherein the one or more sidewalls comprise opposing bite regions ; and an inlet to the internal volume ; a dispensing wall , wherein the dispensing wall comprises a self-sealing exit , one or more sidewalls extending from the dispensing wall , wherein the one or more sidewalls and the dispensing wall define an internal volume , and further wherein the one or more sidewalls comprise opposing bite regions ; and an inlet to the internal volume ; wherein the self-sealing exit is selectively configured to transition between a closed configuration, in which the self-sealing exit is closed and drink liquid in the internal volume may not be dispensed through the self-sealing exit , and an open configuration, in which the self-sealing exit is open and drink liquid in the internal volume may be dispensed through the self-sealing exit ; wherein the self-sealing exit is biased toward the closed configuration and is configured to be selectively reconfigured from the closed configuration to the open configuration responsive to user-applied compressive forces to the opposing bite regions ; wherein the bite-actuated mouthpiece has a longitudinal axis that extends through the inlet , the internal volume , and the self-sealing exit ; wherein the dispensing wall has a dispensing-wall thickness that increases toward the longitudinal axis relative to the one or more sidewalls ; wherein the dispensing wall comprises an interior surface that faces the internal volume and comprises a pair of elongate projections that extend from the interior surface ; and wherein the interior surface of the dispensing wall meets the one or more side walls at an acute angle of at least 45°. <EOS>