Have a look at the replies in the other "getting back into it"
thread in this area - My reply there applies to you too. There
are lighter options for a solo tent from tarptent or six moon designs that you may wish to consider.

MRE's are heavy as heck, you carry a lot of water with it. carrying a small stove or esbit tablets and backpacking food
without all the water in it can actully save you weight.

Iodine is seriously old school and (imo) nasty tasting, if you're going to go filterless (I do) consider the more modern chlorine dioxide treatements like aquamira or pristine. Alternatively I'm sure you'll get some suggestions for filters here (I'm a confirmed filter hater..)