Following are a number of back-translations as well as a sample translation for translators of Isaiah 12:3:

• Kupsabiny: “I rejoice over the salvation,
  like when water makes a thirsty person happy.” (Source: Kupsabiny Back Translation)
• Newari: “As water from a spring brings joy,
  so you will rejoice because of this salvation.” (Source: Newari Back Translation)
• Hiligaynon: “As a cold water gives joy to-(the-one-who) is-thirsty, you (plur.) will-rejoice when the LORD will- now -save you (plur.).” (Source: Hiligaynon Back Translation)
• English: “You(pl), his people, will greatly enjoy being saved
  like you enjoy drinking water from a fountain.” (Source: Translation for Translators)