Put a large piece of plastic wrap over a bowl, put the rice on the plastic wrap and then mold the rice into a triangle or ball. This way, even if your hands are not clean, you can make tasty and portable onigiri rice balls.
If you want to make rice balls seasoned with salt, simply add salt to the water before cooking the rice. Then there is no need to use your hands to add salt when making the onigiri. We learned this tip from nutritionists in Miyako, Iwate Prefecture.
Of course you can use furikake flavoring to season your onigiri. Simply put aside furikake in its durable aluminum pack, and it can even survive a flood.