At least now you know who is not your friend and possibly a jerk, better to know such things.
If you can budget 3–5 gallons you can take a real shower (or whatever you want to call dumping a bucket of water over yourself), not even a “sponge bath”. I can’t tell you precisely how much water it takes even though I’ve done it plenty of times; basically, you need no more and no less than enough to rinse off all the soap.
Is there a public swimming pool nearby? If so, paying admission there to use the shower will probably work out a lot cheaper than buying a gym membership or renting a room at a hotel. Train stations and airports sometimes have public showers as well; soap and a towel is usually included in the admission price.
Last year our water heater broke and we were without hot water for about a week while we waited for a repair appointment. We made do with sponge baths, every other day, with water we heated on the stove and put into a bucket in the bathtub. One large bucket is more than enough to get your whole body wet for soaping up and then rinsing off. As @DPRK says, there will be enough left over to pour over your head for a short “shower”.
I dunno, i think my husband could just tell a friend it’s okay to use the shower. So long as he warned me and our adult daughter, who lives here, that a stranger will show up, briefly, for the facilities. If my friend needed a shower, i might “ask” my husband after I’d said “yes” to the friend, or i might just tell him. I can’t imagine he’d say “no, they can’t shower here.”
If he used our towels, is expect whoever invited him over to wash those towels.
Who the hell knows why. It’s odd after you letting him use your shower, but at the first sign of him not being interested in letting you use his shower, I would just move on to other options. I personally don’t care what the explanation is; he doesn’t owe me one. I may reconsider how much of a “friend” he might be, or I may not, depending on past behavior. People get weird and territorial about all sorts of stuff, and me wondering why or speculating why or demanding an explanation, is not helpful, IMHO. It’ll just make you more angry and stress you out. But being upset at this situation is certainly not unreasonable.
I think it is fair to say that friend is being unreasonable about not allowing reciprocal emergency showering. However, it is important to accept that it is actually OK for people to be occasionally unreasonable about things. We all have our stupid little quirks, and those quirks don’t make us assholes or bad friends, they just mean we’re human.
I’m not a person who absolutely must have a shower every day - but the people I know who must have a shower each day are somewhat inflexible about the timing. They take a shower first thing each morning or after they have coffee or every day after they get home from work or right before bed or . . . But the person who needs a shower first thing every morning in order to be able to function can’t take one after work instead and so on. So I’m wondering if the friend’s refusal to let you use the shower is related to timing ? I mean, although I would normally let a friend or neighbor use my shower , it might be different if they were going to come over and shower at 5 am (because they leave for work at 6 ) when I don’t normally wake up until 7:30.
I’d say this gives you information as to how strong of a friendship this guy thinks the 2 of you enjoy. Which should inform your assessment of the relation.
Personally, I’m with the “couple of days of sponge baths won’t kill you” camp. And yeah - what were the circumstances when he was showering at your place? And the “absolutely needs a hot shower once a day to function” sounds a bit extreme.
Well, that thread was interesting … and definitely goes to show how odd some people can be about things 98% of the rest of the human population wouldn’t have a problem with. Best not to go into a deep psychological dive or cast aspersions on it – it will do no good. Just accept some people are wired differently and have very different boundaries than you. As long as there are not other things in the friendship that raise red flags, it’s just something to accept as an irrational quirk. Lord knows we all have them.
BTW, if a local gym won’t let you use their showers without paying, there may be municipal facilities you can use. Years ago my parents’ house was without power for over a week after a hurricane and they used the showers at the town pool.