In outer space, there is less oxygen. How can it be managed by astronauts, and how many oxygen gallons can they carry with them? Do they have any alternate for oxygen there?

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There is less oxygen, almost no oxygen in outer space.
That is WHY they have a spacesuit in the first place. Otherwise:-
  • The radiation from the sun on one side and the coldness of outer space from the other side will cause hypothermia and sunburn AT THE SAME TIME
  • Since the pressure of outer space is practically zero, literally all the blood in your body will want to come out as fluids move from higher pressure to lower pressure. It's similar to a nose bleed people get when travelling to high altitudes, if they did not acclimatize well.
  • Obviously, since there is no oxygen, there is no way a person will be able to survive, but other things will kill him first before the lack of oxygen.
The astronauts have 2 tanks, each capable of supplying over 800 litres of pure oxygen, which is pressurized to 1 atm pressure in the space suit. The spacewalk can go on 16 hours with this much oxygen.
In the space station, they use hydrolysis and electricity to break water into hydrogen and oxygen. The former is used as a fuel, while the latter is used for respiration.
The ISS does get refueled whenever they are running low on supplies. As for the spacewalk, there is no other way to get more oxygen than to just dock at the ISS and get more.

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