I share my garden with a neighbor. Although they put a line down the middle delineating or spots, they complained I took up half the garden lol

So I took out a few plants (the plot is only 5 ft by 20) and I have only 4 plants left in that plot.

This is the 2nd year of this garden with this neighbor and they think that they can just plant and water.. sporadically.. in the evening and will leave plants dry all day in the hot sun.

Last year I didn't have money to get a sprinkler, they did but failed to buy one.

So I did most of the watering by hand almost daily and it was very hard for me. I know it's better to water deeply once a week etc and planned on getting a sprinkler this year. They would water on occasion but just enough to wet the top of the soil.

Last year we had blossom end rot on the squash and she was told by 2 different sources that it's because the squash was watered too much and to water it every other day. But I've read that it can be a lack of calcium in the soil.

Now mind you, in their half of the garden they planted seedlings in bunches without separating them and didn't water them in anyway.

So here I am, worrying about their plants etc which take over 3/4 of the garden and will probably not grow well if at all and now she only wants the squash watered every other day. Now if I get a sprinkler and water once a week that would work out. But if it ends up being a handheld hose that will be a problem.

I figure I can just water my plants and ignore theirs as mine are on the end but then their plants will die because she insists on watering at night, but doesn't do it every night or (only wets the top 1/2 inch of soil) leaving plants dry as a bone during hot summer days.

She doesn't even regularly water the flowers in pots and on the front porch ( I only have a back door so I have to go down 3 flights and out front everyday in the hot months, dragging the hose to water. I suggested that she fill gallon jugs with water and leave them there so that she or even I can easily water them when need be.

Well, she hasn't and I haven't (they're her plants anyway) and one box of flowers is already dead.

Ugh....I hate to see plants die but I don't have the strength for this again this year to water all 5 garden areas and pots daily

Any suggestions on how to make this work?