Normal solder will work just fine, wash out the tank well with hot & soap and water and re sweat the fitting into the tank.
Acid or rosin core solder works well or soldering paste. You want it
re sweated not "mudded" I prefer to use a big old soldering copper,
not a propane torch. But if it is clean a torch will work ok.
The key here is CLEAN and use acid or paste. I would not braze it. Brazing is too hot, even silver solder is a little too hot.
I guess plastic tanks are ok, but I prefer old school galvanized steel.
They went to plastic because it is rust free, & less expensive to manufacture.
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