If you're near a Walgreens, I've had luck finding this or similar, and it works well - https://www.walgreens.com/store/c/no-rinse-moisturizing-body-wash/ID=prod3946589-product
Depending on where you're at, or if you're able to ship Amazon to a locker, etc., these are awesome for a simple fresh clean - https://www.walgreens.com/store/c/no-rinse-moisturizing-body-wash/ID=prod3946589-product
And if you check Walmart, you may or may not have luck finding something along these lines - https://www.walmart.com/ip/Grime-Boss-Field-Wipes-24ct/55302028 - It really depends which Walmart you're at and your part of the country. Some have bath/shower wipes with all of the other personal hygiene/bath products. Some only have them back in the camping/outdoor sections. Some have multiple varieties in both places, and some don't even sell them at all.
I also have a solar shower like - https://www.amazon.com/Coleman-2000014865-5-Gallon-Solar-Shower/dp/B0009PUT20 - which you can definitely find a lot of places, though I don't really use it.
I keep all 4 of these things in my van along with my other "normal" shower, all in a 5 gallon bucket - https://www.amazon.com/Ivation-Portable-Outdoor-Battery-Powered/dp/B00IFHFJXI, which can be used in any water source. You may have luck finding it at Walmart, but a better chance at an outdoor store like Bass Pro Shops, Cabellas, Gander Mountain, or REI
Shower Tent: https://www.amazon.com/gp/product/B01AT3SZ36/ref=ox_sc_act_title_10?smid=AA9QUDWBLIJKI&psc=1
Shower Head: https://www.amazon.com/gp/product/B00IFHFJXI/ref=ox_sc_act_title_22?smid=A2LM6ZPY06LT1N&psc=1
or you can go ahead and use a solar bag shower: https://www.amazon.com/Coleman-2000014865-5-Gallon-Solar-Shower/dp/B0009PUT20/ref=sr_1_10?s=sporting-goods&ie=UTF8&qid=1550432756&sr=1-10&keywords=solar+bag+shower