food, provisions
粮 centers on edible supplies: food and provisions, especially grains or rice carried for a journey or stored for later use.
粮 combines 米 (rice, grain) with 良, which likely contributes the sound and the idea of good, wholesome food. It is a simplified variant of 糧, where the right side is replaced by the simpler 良.
The left side is 米 (rice), and the right side 良 suggests something good. Picture a sack of good rice that serves as food and provisions for a long trip.
For リョウ, imagine a traveler named Ryo packing his provisions: Ryo -> リョウ, and he fills his bag with rice from the 粮.