QUOTE(HandsomeDupe @ Jul 10 2014, 11:49 AM)
Any state within 4-5 hours drive from KL should be fine.
I'm planning to go kerinci on October and rinjani by May next year. So I gonna test my wet and dry packing

Try those mountains within the Cameron Highland range. Should be good for you since it will take less than 4 hours of hike and you are able to camp there.
They are: -
Gunung Yellow - approximate 3-4 hours, campsite on the peak, got water source about 3-5 minutes hike down from the campsite on your right. Could drop by to Gunung Pass at one of the junction. Less than 2 minutes, no view point.
Gunung Suku - approximate 2-3 hours, two campsites on the peak. False peak on the right, actual peak on the left. Water source will be the ravine before the summit climb as it is a M type of mountain.
You might want to consider: -
Bukit Kutu @ KKB - 4-5 hours hike from Sungai Pertak. First two rivers have bridge, once you cross the third river, stay left and the trail will lead you up. There are water source in the peak but I wouldn't be sure whether it is still clean since people kept litter around the peak in the past.
Gunung Ulu Semangkok @ Fraser - 3 hours hike from GAP Rest house. No water source. Windy during the night.
Pine Tree Trail & Twin Peak @ Fraser - Indication of last water point at KM 3-3.9 marker. Most people camp there but you could opt to camp at either peak.
Gunung Bunga Buah @ Genting - Cannot remember about my hike there but should be around 4 hours hike with most people camp near to the beirut. Able to see Klang Gate Dam and Genting Highlands if weather is clear. Will ask about the water source if keen.