You should put ALL of the food in the cage in the evening just before or about the time your glider usually wakes up.
Gliders are nocturnal and do 99% of their foraging/eating during the night. A few gliders might get up during the day and get a drink of water and eat a little if there are treats in the cage, but most gliders do not get up at all during the day and would miss out on key nutrients if part of their overall feeding was put in the cage in the morning.
Feed 1 TBS HPW, 1 TBS fruits and 1 TBS vegetables (per glider) in the evening. Gliders have small stomachs and eat only a small amount each time they visit the plate, but they will eat several times off and on all night long.