You might worry that refilling ink tanks with bottles might be a messy business. That often used to be the case but times have changed. Nowadays, ink bottles generally have individually keyed tops, so each one only fits in the correct tank. What’s more, they’re gravity fed so there’s no squeezing involved, and ink is only released via an internal valve once the bottle is safely positioned in the receptacle at the top of the tank. The valve will also shut off automatically once the tank is full. You can pretty much guarantee there’s no mess involved.