I know this will blow your budget but here goes.
Take a few materials along so at least you can build a fire if you run out of fuel. Fire steel and some tinder is a good thing.
Later replace your backpack with a mariposa, and tent with a tarptent rainbow. That will save a few pounds. Later get a lighter summer bag or quilt.
Later ditch the heavy kitchen setup and learn how to bag cook. IE when bag cooking instant rice or instant oatmeal, you only have to boil water and there is no cleanup and its lighter. You can boil on a fire, fire in a bush buddy or on a .5 oz alcohol stove.
Actually a bag cook setup is almost free and lightens things up a lot. Start off with the tall country time lemonade container and a 24 oz fosters can to cook in.
Make a beer can alcohol stove. My entire kit stove and all weighs 5 oz.
One of my later stoves.
Pic of fosters can in the container
These containers can handle hot water, so good for coffee tea etc. Put the freezer bag with food inside in the container, pour in boiling hot water, put the top on it and let it stew. Some people wrap them with a pot Cozy. That helps keep the heat in.
This is a 16 oz kit that is made from a cut down can and the shorter country time lemonade container. Weighs 4oz.
If you are going to change to this setup, you need to cook on it at home and get comfortable with it before you hit the trail.
If those are like mcdonalds plastic utensils, I would go to the dollar store and pick at least one cheap thin metal spoon. Light my fire sporks are okay. Get a titanium spoon or spork later.
48oz of food is not enough for 3 days so you will be hungry. You need at least a 1.5#-2# per day. If a big person maybe 2#, but its only 3 days so its not a big deal if you want to skimp on the food.
Don't find much rope that weighs 1.7 oz so I assume its short. Take a decent length of paracord or 50' of triptease. 50' of triptease only weighs 1.5oz. Good for all sorts of stuff liking hanging your cloths to dry.
Probably need some way to hang your food to keep the critters out of it.
That is light for first aid, but people vary for what they take.
I assume pancho is poncho. If really 1.9oz like a plastic elcheapo job and you really want to stay dry, forget that and get a driducks rainsuit. You can find them online for about $12 I think.
I did not see a pack liner and did not see a pack cover.
Get a trash compactor bag for a liner.
A lot of people just go tablet water treatment only, but I think you need to filter then treat with tablets or chlorine. Get an Aquamira frontier pro filter and look around on how to set it up. They have a charcoal filter section, so filter to take out the big stuff and get rid of chemicals etc then treat to kill bacteria and viruses. You need a dirty water scoop, a dirty water container of some sort, then filter it to clean bottles then treat in the clean bottles. Jason Klas (sp) has a youtube on a setup. Depends a lot on the water source, but in general filter and treat is the safest.
In the mountains you probably need some sort of light insulated top. Take at least a light fleece top. Hit the salvation army.
You probably should take some extra cloths too.
I would not wear bluejeans especially under a poncho.
Been there done it and you end up with soggy legs that never dry. Miserable.
If you have to cross water and they get wet, again never dry. I really prefer to wear jeans, but in the wet outdoors
they can be a real PIA especially if that is all you have.
For a 3 day summer smokey trip, I would wear.
Bike type shorts under, Either poly or smartwool, with zip off leg nylon shorts over. (carry the legs in the pack)
If I thought it would be really hot and humid during the day a thin cotton Tee shirt (yep cotton) cooler when its hot. The only cotton item I would carry.
Sun Hat. (I did not see a hat on your list)
Merino wool socks and running shoes.
In my pack I would carry a set of smartwool long johns and long sleeve top, but I always carry those if I think the temps can dip.
Extra pair of light merino wool socks.
Some wool gloves of some sort. I use them as a pot lifter so I always carry them.
An elcheapo beanie. They weigh about 2 oz.
A light insulated top like fleece for you since its cheap but I would carry a SUL insulated jacket like a montbell thermawrap. I use that as a pillow at night.
If doing a water crossing you might want to consider some
water crossing shoes/camp shoes.
Thats a lot of clothes and really for 3 days you can just go with the cloths on your back, and maybe some spare socks
and just use the driducks suit if you get chilly.
You just have to make sure you stay dry.
Only 50dF and wet in wind and you will go hypothermia.
Been there and its miserable.
Actually I don't see quite a few things I would take.
Maybe look at my list as a reference. Might give you some ideas.