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°.