Well let's see, you said "basic stuff." Since I've only recently started using my boat, I still mostly just have basics (with, of course, many mods and additions planned 
).
A lot depends on where and when you'll be boating but even for a relatively benign place/day trip I would have this gear:
1) Required Coast Guard safety equipment
2) Four dock lines
3) 2-4 fenders with whips
4) Paddle or oar
5) Anchor and rode (even if you will not be anchoring, it's like an emergency parking brake)
6) Functioning navigation and anchor lights (of course you will have them, double check their operation)
7) VHF radio
8 ) Flashlight(s) or headlamp(s)
9) Some form of rations and some water
10) Functioning porta potti and/or WAG bags (I would add to Will-C's recommendation of a PP with a larger tank, simply by saying "can you carry that much weight when it is full, including maneuvering it up and out of its niche in the boat?" I could not and thus stick with the original, smaller tank size.)
11) Boat hook of some sort
12) Bedding
13) Footwear (I dislike wearing shoes with "land dirt" aboard).
14) Some sort of tool kit (even if minimal)
15) Log book
16) Digital camera (photos are good reminders of to-do's, if nothing else!).
17) Charts or maps, depending on if you are on a tiny lake or a larger body of water
18 ) At least a couple of nesting buckets, maybe more (useful for everything from bailing to holding dock lines and etc.)
19) Absorber™ chamois
20) Fuel additives, if you use them (I carry blue Sta-Bil and Yamaha Ring-Free)
21) 1 spare quart engine oil
22) Fuel diapers (I cut them into fourths and make a hole in the middle, then fit them around the filler area)
23) Blue nitrile disposable gloves
24) Garbage bags or receptacle.
Some of the last few wouldn't be needed on a day trip.
Have fun!
Sunbeam :hot
).A lot depends on where and when you'll be boating but even for a relatively benign place/day trip I would have this gear:
1) Required Coast Guard safety equipment
2) Four dock lines
3) 2-4 fenders with whips
4) Paddle or oar
5) Anchor and rode (even if you will not be anchoring, it's like an emergency parking brake)
6) Functioning navigation and anchor lights (of course you will have them, double check their operation)
7) VHF radio
8 ) Flashlight(s) or headlamp(s)
9) Some form of rations and some water
10) Functioning porta potti and/or WAG bags (I would add to Will-C's recommendation of a PP with a larger tank, simply by saying "can you carry that much weight when it is full, including maneuvering it up and out of its niche in the boat?" I could not and thus stick with the original, smaller tank size.)
11) Boat hook of some sort
12) Bedding
13) Footwear (I dislike wearing shoes with "land dirt" aboard).
14) Some sort of tool kit (even if minimal)
15) Log book
16) Digital camera (photos are good reminders of to-do's, if nothing else!).
17) Charts or maps, depending on if you are on a tiny lake or a larger body of water
18 ) At least a couple of nesting buckets, maybe more (useful for everything from bailing to holding dock lines and etc.)
19) Absorber™ chamois
20) Fuel additives, if you use them (I carry blue Sta-Bil and Yamaha Ring-Free)
21) 1 spare quart engine oil
22) Fuel diapers (I cut them into fourths and make a hole in the middle, then fit them around the filler area)
23) Blue nitrile disposable gloves
24) Garbage bags or receptacle.
Some of the last few wouldn't be needed on a day trip.
Have fun!
Sunbeam :hot