Actually, a distance of 8 to 12" when using a 160 watt mercury vapor bulb is VERY dangerous. The distance to a 100 watt MVB would be a
minimum of 12" so she is actually incorrect with the info she is giving you. What is the distance from the bulb to where your beardie is basking? If closer than 18", you need to either put the light on a stand to raise it higher or lower the basking area. I found this info on the reptiluv website, the place where they make the bulb and Bob Mack explains what the distance should be for a 160 watt:
The wattage bulb depends on the distance from the bulb to the basking area. Generally with a cooler habitat as you have mentioned, a 160wt Mega-Ray® at 16-20" will do the trick, BUT!! Always triple check the basking area temps right under the bulb before allowing your pet to test the area.
So bare in mind that those bulbs are very strong, not only heatwise but also strong with the amount of ultra violet rays that they produce, so if a 160 watt is too close, it can do damage to your beardie.
I think the woman was talking about getting Pedialyte which helps raise their electrolyte level to prevent dehydration. You can also dilute it and offer it by a plastic medicine dropper by putting drops on his nose for him to lick off. Another way to keep him from losing weight, it to pick up chicken or turkey babyfood as well as some squash, mix a small amt of the meat with a larger amt of squash and a little bit of Pedialtyte to thin it a little, offer that also by a plastic medicine dropper for him to lick off his nose. The meat will help give him a little protein in his diet.