[Will]

You don't need to trade within the Wombat Protectorate (although it would probably be easier to get an accepted proposal via the alliance). As long as the other player is aqua team, you get the +1 happiness bonus. In the search box at the bottom of each page, select the last option ("Team + Resources") and search for 'aqua water'. It is sorted by the last active time. Just take a look through there to see if anyone does not have your resources yet and has open trade slots (they do if they have less than 10 resources without a harbor, or less than 12 with a harbor). And even then, if you really want to get water for something (maybe the beer bonus resource?) then it might be worth it to forgo the +1 happiness bonus and get the resource anyway. But then again, this is also harder to get accepted.