Finding the is just the first step. Unlike a Mozart sonata, this music cannot be played strictly "as written." It demands that two guitarists become one organism—one steady as water, the other passionate as wine.
Meanwhile, the accompanist is fighting a battle against rigidity. The ostinato patterns in the lower registers are notoriously demanding on the left hand. If the player treats the PDF as a strict grid, the "Water" freezes. It becomes ice. The duo fails because the water must flow for the wine to be drinkable.
If you're unable to find a pre-made arrangement, consider transcribing the song yourself or commissioning a musician to create an arrangement for you. Given the popularity of "Água e Vinho," there's a good chance someone has already transcribed it for guitar duo.
: Multiple versions are available, including a Guitar Melodico Duo and an arrangement by Wulfin Lieske .