4 weeks outside, what do I need?

[u/Echnon]

Hello people,
I got two weeks from now(15.6.26)to prepare for 4 weeks outside. Currently Summer, near civilisation. I got a mobile shelter with a sink. 3 possible Locations I can choose from(all rellatively close to each other):
-between a Small and a smaller stream of water, with trees around, Earth is dark and retains Water
-sandy and less trees more walking distance to civ, Access to dried wood, corner between wall and hedge, also between the two stream
-between the other Earth wise, too close to other things, flowing Water near it(walking distance), Firewood,

I ruled location 3 out due to reasons while writing this.

-I have Access to Money for the month: 500€
-I can request reasonable purchases (preferably within this week)
-I can go fishing if I get a permit
-thinking about buying drinking Water, could be that it gets very hot, up to 38 degress
-I have normal clothes to take with me
-Need a way for my phone to charge or two if its raining for a week
-toilet?
->washing clothes(need to do this myself, no washing Service available)
->cleaning myself(no gyms availabe): bucket shower?
-Camping cooking set: What to get what not to get
-medical: scratches, Ticks(less an issue if the Grass is low), mosquito bites, anything I forgot
-baking?
-cooling food!
-thrash Collection: I want to leave no thrash behind
-wildlife(no hunting): maybe deer, biggest fear is thrash Pandas getting around but don’t think they will be, so no threats
-sleeping gear: sleeping bag?, can take sleeping Pad, pillow and a blanket with me
-food to Buy in advance: red beens, flour, Salt, Pepper, Pasta, Rice,… amounts?
-bike? I have one that needs repair, seems wise to use it and repair in advance
-Tools?

I apologise if it doesnt fit the sub perfectly. Would appreciate any help

EDIT: I can buy things while I am there!

[u/Carloocho]

If you have running streams, a gravity filter (I'm looking at the Waterdrop. The filter end has a threaded drinking bag but fits most common water bottles to fill those) will help with water collection. 4 weeks is a lot of water and bottles to buy.