I don't know how to help you with the weeds, but for watering I use digital water timers that you can get at Canadian Tire (or wherever). My yard has half a dozen hose bibs installed outdoors, so I can control the water in different places at different times with different timers, but I don't water everything. Right now the tomatoes in pots in the greenhouse get watered twice daily (drip line) for about 10 minutes each time, the rhododendrons get watered once daily (soaker hose) for about 10 minutes, and various flowers are on another timer (buried drip hose) and they get watered once every couple days for about 10 minutes. I could set up more to water tomatoes, peppers, kale, leeks, basil, pumpkins, chard, zuchinni, rhubarb, raspberries, grapes, pears, et cetera, but I generally water those by hand only when they really need it. (Or set up a sprinkler or a temporary drip line for them if they really need it.)
When I'm away on trips the automatic watering continues and generally the things that aren't watered survive. (Probably not optimally, but they survive.)
If you have less hose bibs, you can get digital timers with four (and maybe six) valves that connect to a single hose bib. You can then run hoses around the yard to different areas and set it up to water different things from the same hose bib at different times. For example, you might have a sprinkler going for your dill and cliantro every day for 15 minutes, then another valve opens every fourth day for 10 minutes for a different sprinkler on your thyme. The downside of using a single hose bib is that the pressure for all the different sprinkers/lines will be the same when the electric valves open. So although you might need a higher pressure for your larger dill garden, you might water well outside of your smaller thyme garden if you're using identical sprinklers attached to two different hoses and two different electric valves on the same hose bib.
For cilantro and dill I do multiple plantings a year so if they're bolting or going to seed, there's some new crop coming soon. You might consider planting some cilantro and dill before you go and water it well, then when you get back it might be just about edible.
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