Generally, garlic salt doesn't require desiccants for storage, but using them can extend its shelf life and prevent clumping, especially in humid environments.
Garlic salt is a mixture of ground garlic and salt. Salt itself is a natural desiccant, meaning it absorbs moisture. However, the garlic component in garlic salt can attract moisture, leading to clumping and a decrease in flavor over time. While the salt content helps to preserve the garlic, in particularly humid climates, the mixture can still become problematic. Storing garlic salt in an airtight container is the first line of defense against moisture. Adding a desiccant packet, like silica gel, provides an extra layer of protection by actively absorbing any moisture that might enter the container. This is especially helpful if you live in a humid area or if you frequently open and close the container, exposing the garlic salt to air. The desiccant will help keep the garlic salt dry, preventing it from clumping and maintaining its flavor and texture for a longer period.
If you don't have a desiccant packet, you can use a few grains of uncooked rice in the garlic salt container. The rice will absorb moisture, acting as a natural desiccant. Just be sure to replace the rice periodically.