In that case Sir, its easy..... fish maggots and a wagler. find a bit of river where the flow is not too fast (behind a bend or obsticle), set the float at depth to start of with.... but feed maggots well upstream (imagine where they will fall on the river bed - ideally where your float will trot past).
River fish will take a bait at any depth, smaller fish tend to take a bait on the drop.. Bigger fish mope around on the deck. You can change the depth of the float to fish up in the water - but find the depth first as a reference.
Tackle: Match rod, reel with 3.2lb line, waglers (around 4BB shot - good for casting 2/3 rod lengths). Put all the big shot to fix the wagler float in place and use no.8 Dust shot (3 or 4) down the line to the hook to present the maggot hook bait on the drop naturally. As for hooks? good quality Kamasan or similar in size 18 to 1lb14oz hook link or similar.
If the bites dry up - you mention you have a feeder rod... Bang out a small maggot feeder over where you were trotting a float and you may pick up some bigger bonus fish.
As for bait quantities... it depends... I would take 2 pints of maggots.. (if I'm flush may treat myself to 4 pints
Top tip.... travel light. If you don't catch... or stop catching.... MOVE!!!
If I were to suggest some google key words, there should be good advice on the basics in more detail: 'Wagler floats', 'plumbing a swim', 'shotting patterns float fishing'