The ornamental design for a strawbottle, as shown and described.
FIG. 1 is a perspective view of the straw bottle;
FIG. 2 is a front view of the straw bottle;
FIG. 3 is a rear view of the straw bottle;
FIG. 4 is a right side view of the straw bottle;
FIG. 5 is a left side view of the straw bottle;
FIG. 6 is a top view of the straw bottle;
FIG. 7 is a bottom view of the straw bottle; and,
FIG. 8 is a perspective view of the straw bottle with the lid open.
The broken lines showing in the figures are included for the purpose of illustrating portions of the straw bottle that form no part of the claimed design. The dash-dot lines showing in the figures are included for defining the bounds of the claimed design that form no part therof.