3 months worth of toiletries would include one large tube of toothpaste, a toothbrush, a 4 oz thing of deodorant (yes I know it says no larger than 3 oz, no one cares), and a normal size bottle of shampoo (remember, you have no hair), and maybe 3-4 bars of soap (or one thing of body wash).
So yes, I would say bring 3 months worth.
I wouldn't really bother with 3-4 bars of soap. Bring one and a soap case and that should last you through RLP and you can safely use all 4 of the soap bars they issue you. You don't shower every day or even close to that amount so a bar of soap lasts a very long time.
I'd also consider a small clock radio that can be packed away easilly. They're on the no-no list but we all wished we had one at about 3am in the days prior to RLP. Keep it in your car.
And 1-inch wide blue painter's tape for RLP.