Apparently the part with the supermutants blocking the watershed was supposed easy for such character as there's a forced dialogue when you enter the building that lead to the underground ruined vault in which your low level int character is supposed to confuse a moronic supermutant but either the "fixit" mod (that fix lots of bugs in F1) did something bad to that dialogue or it's just not working as intended because the supermutant isn't confused and is always turning hostile once a couple of "Huh?" dialogues (no choices in it) are made.
Anyways it's where i appreciated that i had found a very good sniper rifle (and have very good skill points in it) as along with my murder doggie we annihilated those scary supermutants and could continue our way to the ruined vault underground to fetch that water chip.
Killed a few glowing ghouls (they irradiate you on hit) and could get back to the vault and deliver the chip as requested
The dialogue with the overseer there was a bit funny with my very stupid character but it worked for everyone in the end.
Got enough XP to reach level 7
Then i recieved the last quest, the one to kill the Master, the overseer managed to find words so my stupid character could understand :
Apparently i'm the hero of the vault now, every kids wants to be me , poor parents