There are numerous household items you can shove up your manhole, just be sensible: nothing sharp or anything that can break. Use LOTS of lube. Since safe sex and condoms are not a concern when soloing use oil based lives: they last longer and give a better feel. Go to CVS or anyplace that sells skin care items and make-up and buy a jar of Albolene, it's THE best lube ever for anal play or jerking.
Since I started fucking myself long before I was old enough to buy dildos and vibrators I had to make due with what I could find. Cucumbers seem like a logical choice, but they have sharp bumps. Large carrots are cool, as are corn cobs. Ever wonder where the term "cornholing" came from? Go buy the biggest ears of corn you can find and grease one up, your eyes will roll back in your head when it invades your hungry hole! Kitchen utensils are handy, try anything that looks safe. I used an ice cream scoop (the handle part) for years: it was thick and metal and had grooves that drove my hole crazy.
But the ultimate at home source for horny dildoless bottoms is the your fathers tool room. Thick sturdy objects that can't break. When I was 13 I discovered that the handle of a hammer was heaven! My dad had them in various sizes and I started with the smallest and worked my way up. The anal orgasms were instant addiction, and the amount of cum I'd shoot was miraculous. I used to fake being sick so I could stay home from school and fuck myself all day. As much as I craved a real dick, it was still more than satisfying going solo. Besides, a hammer will never go limp! Even when I had boyfriends (as I do now) I still loved laying on my bed, hammer up my hole, riding it in and out until my cum hits my face. If you want to make cleaning off whatever you use, you can use a condom. I use plastic baggies (NOT the ziploc or slider kind since they are sharp, but the gallon size that require twist ties) on my hammer and coat heavily with Albolene, Crisco or Vaseline. Then when I'm done it just throw the baggie away.
It's much easier to fuck yourself if you shit first, you don't want anything obstructing the toys. Use an enema or anal syringe to get your hole clean.
A vibrator or vibrating
dildo is really a must have, so plan on it. You can order them online shame free. The vibrations add another level of pleasure. The only downside is they can be LOUD if you lack privacy. And if you can, buy a fucking machine! You can buy one online, but they can be noisy. One of my friends let's me use his and it's mind shattering! I would never buy one because I would probably become addicted and never leave the house or need anyone to fuck me.