Can only tell you what i have been using for mahseer up here in the north. Have already mentioned the rod and reels i have. Here is the other tackle I think is needed.
In the big lakes of Bhakra and Pong.
Line : 30lbs braid.
Leader : 30lbs Florocarbon (the fish are getting very smart up here and seem to be able to see the line)
Lures : Shad Raps (no 7), FatRaps, DTs, Husky Jerks, Small Magnums, Countdowns, Tail Dancers, Rattlin Rapalas a few small and medium tobys and Lil Cleos and few spinners.
Colours : In bright sunlight - the more natural looking the better so go for Shads, trouts, silvers, perches, crawdads etc. Dusk to Dawn - fire tigers, clowns, gold. Spinners and spoons in brass and silver.
In fast water.
Line : 30lbs braid topped off with 100-150mtrs of good mono (platypus) of about 30lbs. Though with all the break off you'll want to get 50lbs mono. But don't as you will cast shorter.
Lures : Jointed Rapalas, Original Raps for the rapids. Rattling Raps and Tail Dancers (they seem to kick up a lot of mud/silt/gravel from the bottom and attract the fish) for the pools.
Colours : Gold, Silver and all the trouts. Fire tigers too. I paint my Jointed gold underneath with a nice moss green on top. Pretty close to what we call a soli up here. will try and post a pix when I do the next batch, the present one is pretty beat up. (paints used - Compaint spray cans)
Get good Snap Swivels, A great set of pliers, a good knife, nail cutter and scissors, polarisers, a good hat with a neck cover.
Get Smelly Jelly or Carolina lunker Sauce.
Keep some heavy mono for "beavers".
And never keep your deos, insect repellants, soaps, shampoos or any other smelly stuff with your kit.