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There are two sets of armor that are on the cheap. One is full black dragon hide armor. This will provide a great good range attack bonus, while protecting from some of the attacks dealt by the KBD. To complete this set of armor, you will need to get either a Helm of Netiznot, if you received it from the quest, or just get a snakeskin bandana to boost your range. The other armor you can choose to wear is full ranger void. This is free and even better than black dragon hide; however, it does take quite some time to get it from the Pest Control minigame.
Other items you will have to get are either climbing, dragon, or snakeskin boots, an Ava's Accumulator, a rune crossbow, Diamond (e) bolts, an anti-dragon shield, and an amulet of glory or an amulet of fury.
For supplies, you can keep it very simple. Get 2-3 ranging potions, 2-3 anti-fire potions, a teleport tab to Varrock, and the rest of your inventory should be good food, like monkfish or sharks. You can get better food if you want, but many people think it would just be a waste of money to get anything more expensive.