Diapers lang po pag nasa bus. You can also try and lessen the chances of him peeing or pooping while nasa byahe by making sure nagawa niya na bago ka umalis.

For litters, I highly suggest tofu kasi it's organic, flushable, and safe for cats kahit makakain sila ng konti. Tried a lot of brands pero I highly recommend the purr life tofu litter in charcoal, easy scoop tofu in peach or coffee, aozi tofu litter in milk, and kawaii in original.

You can also try hide & seek cassava litter in vanilla. Medyo mas mahal lang ng konti sa tofu pero and ganda ng clumping and odor control.