Personal admin/Hygiene
Going for 48 hours without washing will "probably" not kill you. I mean Jaykay from Jamiroqui last washed in 1983 and is fine.
There are however a few things that are useful:
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Insect repellent. In the warmer (game season) months most sites will have flying bugs. If you are out at night or lying up you can end up being a magnet for creepie crawlies.
There are various strengths and products designed to treat clothing and mosquito nets as well as put directly on your skin. DEET is a common ingredient but deet free versions exist for those who don't like it.
In the UK the main problem are tick which carry various unpleasant diseases. In addition to repellant you can get tick removal tweezers, but not best used mid-game....
Remember to blouse those combat trousers!
"Hygine kit" If you are planning on being on the game field for more than a day a small ziploc bag containing, wet wipes, tissues, rubbish, hand gel and a chewable toothbrush will cover a lot. Add a small booboo pouch of plasters and blister pads and it can easily be wedged in the back of a hydration pouch or pocket. Lip balm and sun block (if needed) are better kept in a chest pocket or similar.
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At the FOB:
Some sites are blessed with actual toilets, maybe even a shower bock. For most it's a portaloo who's previous user was Big Dave who staggered in after a bender last night and has just emptied out three king size doner kebabs. This is why it's good to have toilet roll, hand sanitizer and a gas mask at base camp. ?
If you are at an event with no facilities at all building your own "log cabin" in the game field isn't really the done thing. There are simple portable sets ups that use a small pop up tent, Bucket with seat and a bag of absorbent material.
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The same tent can generally be used to hang up a solar shower. Ideally these should be filled with mains/potable water as water from a stream will still carry bacteria. These will breed like crazy in the shower given a few days of warmth.
If you are going to the point of having an actual wash kit then a lot of travel soap or trek wash is designed to be used with little or no additional water. Which saves a bit of lugging stuff about. Military products like foot (the groin) powder are fungicides meant for longer deployments so also not necessary for a weekend in most cases.