A method for humidification of a vaporizable component from a feed liquid into a carrier gas, the method comprising: flowing the feed liquid including the vaporizable component into a second-stage humidifier chamber of a multi-stage humidifier to form a second-stage humidifier bath at a second humidification temperature, wherein the multi-stage humidifier is an integral structure, with the stages separated by a sparger plate; flowing via a conduit a first remnant of the feed liquid from the second-stage humidifier chamber into a first-stage humidifier chamber of the multi-stage humidifier to form a first-stage humidifier bath at a first humidification temperature, wherein the first-stage humidifier chamber and the second-stage humidifier chamber are vertically stacked, and wherein the first humidification temperature is lower than the second humidification temperature, wherein the first- and second-stage humidifier baths each have a width, measured perpendicular to the flow of the carrier gas through the bath, and a height, measured parallel to the flow of the carrier gas through the bath, and wherein the width is at least twice as great as the height; removing a second remnant of the feed liquid from the first-stage humidifier chamber; injecting the carrier gas into the first-stage humidifier bath in the first-stage humidifier chamber and bubbling the carrier gas through the first-stage humidifier bath via a sparger plate, where the carrier gas collects the vaporizable component in vapor form from the first remnant of the feed liquid to partially humidify the carrier gas with the vaporizable component; wherein the carrier gas enters the top gas region above the first-stage humidifier bath and then proceeds to the second-stage humidifier chamber; directing the partially humidified carrier gas directly from the first-stage humidifier chamber through the sparger plate into the second-stage humidifier bath in the second-stage humidifier chamber and bubbling the carrier gas through the second-stage humidifier bath, where the carrier gas collects more of the vaporizable component in vapor form from the feed liquid to further humidify the carrier gas with the vaporizable component; removing the humidified carrier gas from the second-stage humidifier chamber. flowing the feed liquid including the vaporizable component into a second-stage humidifier chamber of a multi-stage humidifier to form a second-stage humidifier bath at a second humidification temperature, wherein the multi-stage humidifier is an integral structure, with the stages separated by a sparger plate; flowing via a conduit a first remnant of the feed liquid from the second-stage humidifier chamber into a first-stage humidifier chamber of the multi-stage humidifier to form a first-stage humidifier bath at a first humidification temperature, wherein the first-stage humidifier chamber and the second-stage humidifier chamber are vertically stacked, and wherein the first humidification temperature is lower than the second humidification temperature, wherein the first- and second-stage humidifier baths each have a width, measured perpendicular to the flow of the carrier gas through the bath, and a height, measured parallel to the flow of the carrier gas through the bath, and wherein the width is at least twice as great as the height; removing a second remnant of the feed liquid from the first-stage humidifier chamber; injecting the carrier gas into the first-stage humidifier bath in the first-stage humidifier chamber and bubbling the carrier gas through the first-stage humidifier bath via a sparger plate, where the carrier gas collects the vaporizable component in vapor form from the first remnant of the feed liquid to partially humidify the carrier gas with the vaporizable component; wherein the carrier gas enters the top gas region above the first-stage humidifier bath and then proceeds to the second-stage humidifier chamber; directing the partially humidified carrier gas directly from the first-stage humidifier chamber through the sparger plate into the second-stage humidifier bath in the second-stage humidifier chamber and bubbling the carrier gas through the second-stage humidifier bath, where the carrier gas collects more of the vaporizable component in vapor form from the feed liquid to further humidify the carrier gas with the vaporizable component; removing the humidified carrier gas from the second-stage humidifier chamber.